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Protocol - Visual Function

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Protocol Name from Source:

The Expert Review Panel has not reviewed this measure yet.

Availability:

Publicly available

Description:

Self-reported vision-targeted health status is measured with the Vision Function Questionnaire (VFQ-25). This interviewer or self administered questionnaire consists of a base set of 25 vision-targeted questions representing 11 vision-related constructs, plus an additional single-item general health rating question. The VFQ-25 also includes an appendix of additional items from the 51-item National Eye Institute Vision Function Questionnaire version that researchers can use to expand the scales up to 39 total items. Scoring of the VRQ-25 yields 12 sub-scale scores and an overall composite score.

Protocol:

Administration Instructions:

Participants should answer all the questions as if the participant is wearing his/her glasses or contact lenses (if any).

An Appendix of additional questions may be added to address other sub-scales of vision-targeted health-related quality of life. For example, if a user is testing a new treatment for macular degeneration, by adding near vision questions A3, A4, and A5 to VFQ-25 questions 5, 6, and 7, the investigator would have a six-item near vision scale rather than a three-item scale. The addition of these items would enhance the reliability of the near vision sub-scale and is likely to improve the responsiveness of the sub-scale to the intervention over time. If items from the appendix are used, the VFQ-25 developers encourage users to incorporate all optional items for a given sub-scale. This strategy will enhance the comparability of results across studies.

Skip Question 1 when the VFQ-25 is administered at the same time as the SF-36 or RAND 36-Item Health Survey 1.0

PART 1- GENERAL HEALTH AND VISION

1. In general, would you say your overall health is:

[ ] 1 excellent

[ ] 2 very good

[ ] 3 good

[ ] 4 fair

[ ] 5 poor

2. At the present time, would you say your eyesight using both eyes (with glasses or contact lenses, if you wear them) is excellent, good, fair, poor, or very poor or are you completely blind?

[ ] 1 excellent

[ ] 2 good

[ ] 3 fair

[ ] 4 poor

[ ] 5 very poor

[ ] 6 completely blind

3. How much of the time do you worry about your eyesight?

[ ] 1 none of the time

[ ] 2 a little of the time

[ ] 3 some of the time

[ ] 4 most of the time

[ ] 5 all of the time

4. How much pain or discomfort have you had in and around your eyes (for example, burning, itching, or aching)? Would you say it is:

[ ] 1 none

[ ] 2 mild

[ ] 3 moderate

[ ] 4 severe

[ ] 5 very severe

PART 2- DIFFICULTY WITH ACTIVITIES

The next questions are about how much difficulty, if any, you have doing certain activities wearing your glasses or contact lenses if you use them for that activity.

5. How much difficulty do you have reading ordinary print in newspapers? Would you say you have:

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

6. How much difficulty do you have doing work or hobbies that require you to see well up close, such as cooking, sewing, fixing things around the house, or using hand tools? Would you say:

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

7. Because of your eyesight, how much difficulty do you have finding something on a crowded shelf?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

8. How much difficulty do you have reading street signs or the names of stores?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

9. Because of you eyesight, how much difficulty do you have going down steps, stairs, or curbs in dim light or at night?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

10. Because of your eyesight, how much difficulty do you have noticing objects off to the side while you are walking along?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

11. Because of your eyesight, how much difficulty do you have seeing how people react to things you say?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

12. Because of your eyesight, how much difficulty do you have picking out and matching your own clothes?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

13. Because of your eyesight, how much difficulty do you have visiting with people in their homes, at parties, or in restaurants?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

14. Because of your eyesight, how much difficulty do you have going out to see movies, plays, or sports events?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

15. Now, I'd like to ask about driving a car. Are you currently driving, at least once in a while?

[ ] 1 yes (skip to Q15c)

[ ] 2 no

15a. IF NO, ASK: Have you never driven a car or have you given up driving?

[ ] 1 never drove (skip to Part 3, Q17)

[ ] 2 gave up

15b. IF GAVE UP DRIVING: Was that mainly because of your eyesight, mainly for some other reason, or because of both your eyesight and other reasons?

[ ] 1 mainly eyesight (skip to Part 3, Q17)

[ ] 2 mainly other reasons (skip to Part 3, Q17)

[ ] 3 both eyesight and other reasons (skip to Part 3, Q17)

15c. IF CURRENTLY DRIVING: How much difficulty do you have driving during the daytime in familiar places? Would you say you have:

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

16. How much difficulty do you have driving at night? Would you say you have:

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

16a. How much difficulty do you have driving in difficult conditions, such as in bad weather, during rush hour, on the freeway, or in city traffic? Would you say you have:

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

PART 3: RESPONSES TO VISION PROBLEMS

The next questions are about how things you do may be affected by your vision. For each one, I'd like you to tell me if this is true for you all, most, some, a little, or non of the time.

17. Do you accomplish less than you would like because of our vision?

[ ] 1 all of the time

[ ] 2 most of the time

[ ] 3 some of the time

[ ] 4 a little of the time

[ ] 5 none of the time

18. Are you limited in how long you can work or do other activities because of your vision?

[ ] 1 all of the time

[ ] 2 most of the time

[ ] 3 some of the time

[ ] 4 a little of the time

[ ] 5 none of the time

19. How much does pain or discomfort in or around your eyes, for example, burning, itching, or aching, keep you from doing what you'd like to be doing? Would you say:

[ ] 1 all of the time

[ ] 2 most of the time

[ ] 3 some of the time

[ ] 4 a little of the time

[ ] 5 none of the time

For each of the following statements, please tell me if it is definitely true, mostly true, mostly false, or definitely false for you or you are not sure.

20. I stay home most of the time because of my eyesight

[ ] 1 definitely true

[ ] 2 mostly true

[ ] 3 not sure

[ ] 4 mostly false

[ ] 5 definitely false

21. I feel frustrated a lot of the time because of my eyesight

[ ] 1 definitely true

[ ] 2 mostly true

[ ] 3 not sure

[ ] 4 mostly false

[ ] 5 definitely false

22. I have much less control over what I do, because of my eyesight

[ ] 1 definitely true

[ ] 2 mostly true

[ ] 3 not sure

[ ] 4 mostly false

[ ] 5 definitely false

23. Because of my eyesight, I have to rely too much on what other people tell me

[ ] 1 definitely true

[ ] 2 mostly true

[ ] 3 not sure

[ ] 4 mostly false

[ ] 5 definitely false

24. I need a lot of help from others because of my eyesight

[ ] 1 definitely true

[ ] 2 mostly true

[ ] 3 not sure

[ ] 4 mostly false

[ ] 5 definitely false

25. I worry about doing things that will embarrass myself or others, because of my eyesight

[ ] 1 definitely true

[ ] 2 mostly true

[ ] 3 not sure

[ ] 4 mostly false

[ ] 5 definitely false

Appendix of Optional Additional Questions

SUBSCALE: GENERAL HEALTH

A1. How would you rate your overall health, on a scale where zero is as bad as death and 10 is best possible health?

[ ] 1

[ ] 2

[ ] 3

[ ] 4

[ ] 5

[ ] 6

[ ] 7

[ ] 8

[ ] 9

[ ] 10

SUBSCALE: GENERAL VISION

A2. How would you rate your eyesight now (with glasses or contact lens on, if you wear them), on a scale of from 1 to 10, where zero means the worst possible eyesight, as bad or worse than being blind, and 10 means the best possible eyesight?

[ ] 1

[ ] 2

[ ] 3

[ ] 4

[ ] 5

[ ] 6

[ ] 7

[ ] 8

[ ] 9

[ ] 10

SUBSCALE: NEAR VISION

A3. Wearing glasses, how much difficulty do you have reading the small print in a telephone book, on a medicine bottle, or on legal forms? Would you say:

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

A4. Because of your eyesight, how much difficulty do you have figuring out whether bills you receive are accurate?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

A5. Because of your eyesight, how much difficulty do you have doing things like shaving, styling your hair, or putting on makeup?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

SUBSCALE: DISTANCE VISION

A6. Because of your eyesight, how much difficulty do you have recognizing people you know from across a room?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

A7. Because of you eyesight, how much difficulty do you have taking part in active sports or other outdoor activities that you enjoy (like golf, bowling, jogging, or walking)?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

A8. Because of your eyesight, how much difficulty do you have seeing and enjoying programs on TV?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

SUBSCALE: SOCIAL FUNCTION

A9. Because you your eyesight, how much difficulty do you have entertaining friends and family in your home?

[ ] 1 no difficulty at all

[ ] 2 a little difficulty

[ ] 3 moderate difficulty

[ ] 4 extreme difficulty

[ ] 5 stopped doing this because of your eyesight

[ ] 6 stopped doing this for other reasons or not interested in doing this

SUBSCALE: DRIVING

A10. [This item, "driving in difficult conditions", has been included as item 16a as part of the base set of 25 vision-targeted items.]

SUBSCALE: ROLE LIMITATIONS

A11. The next questions are about things you may do because of your vision. For each item, I'd like you to tell me if this is true for you all, most, some, a little, or none of the time.

a. Do you have more help from others because of your vision?

[ ] 1 all of the time

[ ] 2 most of the time

[ ] 3 some of the time

[ ] 4 a little of the time

[ ] 5 none of the time

b. Are you limited in the kinds of things you can do because of your vision?

[ ] 1 all of the time

[ ] 2 most of the time

[ ] 3 some of the time

[ ] 4 a little of the time

[ ] 5 none of the time

Scoring

Scoring VFQ-25 with or without optional items is a two-step process:

Step 1: original numeric values from the survey are re-coded following the scoring rules outlined in Table 1. All items are scored so that a high score represents better functioning. Each item is then converted to a 0 to 100 scale so that the lowest and highest possible scores are set at 0 and 100 points, respectively. In this format scores represent the achieved percentage of the total possible score, e.g. a score of 50 represents 50% of the highest possible score.

Step 2: items within each sub-scale are averaged together to create the 12 sub-scale scores. Table 2 indicates which items contribute to each specific sub-scale. Items that are left blank (missing data) are not taken into account when calculating the scale scores. Sub-scales with at least one item answered can be used to generate a sub-scale score. Hence, scores represent the average for all items in the subscale that the respondent answered.

Composite Score Calculation

To calculate an overall composite score for the VFQ-25, simply average the vision-targeted subscale scores, excluding the general health rating question. By averaging the sub-scale scores rather than the individual items we have given equal weight to each sub-scale, whereas averaging the items would give more weight to scales with more items.

Table 1. Scoring Key: Recoding of Items

Item Numbers Change original response category(a)
To recoded value of:
1,3,4,15c(b) 1
2
3
4
5
100
75
50
25
0
2 1
2
3
4
5
6
100
80
60
40
20
0
5,6,7,8,9,10,11,12,13,14,16,16a
A3,A4,A5,A6,A7,A8,A9(c)
1
2
3
4
5
6
100
75
50
25
0
*
17,18,19,20,21,22,23,24,25,
A11a,A11b,A12,A13
1
2
3
4
5
0
25
50
75
100
A1,A2 0
to
10
0
to
100
(a) Precoded response choices as printed in the questionnaire.
(b) Item 15c has four-response levels, but is expanded to a five-levels using item 15b.
    Note: If 15b=1, then 15c should be recoded to "0"
    If 15b=2, then 15c should be recoded to missing.
    If 15b=3, then 15c should be recoded to missing.
(c) "A" before the item number indicates that this item is an optional item from the Appendix. If optional items are used, the NEI-VFQ developers encourage users to use all items for a given sub-scale. This will greatly enhance the comparability of sub-scale scores across studies.
* Response choice "6" indicates that the person does not perform the activity because of non-vision related problems. If this choice is selected, the item is coded as "missing."
Table 2. Step 2: Averaging of Items to Generate VFQ-25 Sub-Scales

Scale
Number of Items
Items to be averaged
(after recoding per Table 1)
General Health
1
1
General Vision
1
2
Ocular Pain
2
4, 19
Near Activities
3
5, 6, 7
Distance Activities
3
8, 9, 14
Vision Specific:
Social Functioning
Mental Health
Role Difficulties
Dependency
2
4
2
3
11, 13
3, 21, 22, 25
17, 18
20, 23, 24
Driving
3
15c, 16, 16a
Color Vision
1
12
Peripheral Vision
1
10
Table 3. Step 2: Averaging of Items to Generate VFQ-39 Sub-Scales (VFQ-25 + Optional Items)
Scale
Number of Items Items to be averaged
(after recoding per Table 1)
General Health 2
1, A1
General Vision 2
2, A2
Ocular Pain
2 4, 19
Near Activities 6
5, 6, 7, A3, A4, A5
Distance Activities 6
8, 9, 14, A6, A7, A8
Vision Specific:
Social Functioning
Mental Health
Role Difficulties
Dependency
3
5
4
4
11, 13, A9
3, 21, 22, 25, A12
17, 18, A11a, A11b
20, 23, 24, A13
Driving
3 15c, 16, 16a
Color Vision 1
12
Peripheral Vision
1 10

Personnel and Training Required

The interviewer must be trained to conduct personal interviews with individuals from the general population. The interviewer must be trained and found to be competent (i.e. tested by an expert) at the completion of personal interviews*. The interviewer should be trained to prompt respondents further if a "don't know" response is provided.

*There are multiple modes to administer this question (i.e., pencil and paper and computer-assisted interviews)

Equipment Needs

Either a pencil and paper or computer-assisted instrument may be used. If a computer-assisted instrument is used, computer software may be necessary to develop the instrument. The interviewer will require a laptop computer/handheld computer to administer a computer-assisted questionnaire.

Requirements

Requirement CategoryRequired
Average time of greater than 15 minutes in an unaffected individualNo
Major equipmentNo
Specialized requirements for biospecimen collectionNo
Specialized trainingNo

Mode of Administration

Self-administered

Life Stage:

Adult

Specific Instructions:

None

Research Domain Information

Release Date:

February 26, 2010

Definition

A base set of 25 questions, which can be expanded to 39 total questions, to determine vision-related function

Purpose

Measures the dimensions of self-reported vision-targeted health status that are most important for individuals who have chronic eye disease. The survey measures the influence of visual disability and visual symptoms on generic health domains such as emotional well-being and social functioning, in addition to task-oriented domains related to daily visual functioning.

Selection Rationale

This questionnaire was designed as a subjective measure of visual function (as opposed to performance based measures such as best corrected visual acuity) and, in particular to measure the relationship of visual function to health-related quality of life. Responses to this questionnaire have been shown to be strongly associated with performance based measures of visual function with specific ocular conditions such as diabetic retinopathy. It is also associated with the presence of other ocular conditions, systemic diseases and other measures of quality of life. It can be administered by interview, either face to face or by telephone.

Language

English, Greek, Spanish

Standards

StandardNameIDSource
Common Data Elements (CDE)Person Visual Function Assessment3007696CDE Browser
Logical Observation Identifiers Names and Codes (LOINC)Visual function proto62700-0LOINC

Process and Review

The Expert Review Panel has not reviewed this measure yet.

Source

The National Eye Institute 25-Item Visual Function Questionnaire (VFQ-25) and manual, version 2000.

Mangione, C. M., Lee, P. P., Gutierrez, P. R., Spritzer, K., Berry, S., & Hays, R. D. (2001). Development of the 25-item National Eye Institute Visual Function Questionnaire (VFQ-25). Archives of Ophthalmology, 119:1050-1058.

General References

Mangione, C. M., Lee, P. P., Pitts, J., Gutierrez, P., Berry S., & Hays, R. D. (1998). Psychometric properties of the National Eye Institute Visual Function Questionnaire, the NEI-VFQ. Archives of Ophthalmology, 116: 1496-1504.

Protocol ID:

111201

Variables:

Export Variables
Variable NameVariable IDVariable DescriptionVersiondbGaP Mapping
PX111201_General_Overall_HealthPX111201010000In general, would you say your overall health is:4Variable Mapping
PX111201_Eyesight_Both_EyesPX111201020000At the present time, would you say your eyesight using both eyes (with glasses or contact lenses, if you wear them) is excellent, good, fair, poor, or very poor or are you completely blind?4Variable Mapping
PX111201_Time_Worry_EyesightPX111201030000How much of the time do you worry about your eyesight?4N/A
PX111201_Pain_Discomfort_In_Around_EyesPX111201040000How much pain or discomfort have you had in and around your eyes (for example, burning, itching, or aching)? Would you say it is:4N/A
PX111201_Difficulty_Read_Ordinary_Print_NewspapersPX111201050000How much difficulty do you have reading ordinary print in newspapers? Would you say you have:4Variable Mapping
PX111201_Difficulty_Work_Hobby_See_ClosePX111201060000How much difficulty do you have doing work or hobbies that require you to see well up close, such as cooking, sewing, fixing things around the house, or using hand tools? Would you say:4N/A
PX111201_Difficulty_Find_Something_Crowded_ShelfPX111201070000Because of your eyesight, how much difficulty do you have finding something on a crowded shelf?4N/A
PX111201_Difficulty_Read_Sign_Store_NamePX111201080000How much difficulty do you have reading street signs or the names of stores?4N/A
PX111201_Difficulty_Stair_Curb_Dim_Light_NightPX111201090000Because of your eyesight, how much difficulty do you have going down steps, stairs, or curbs in dim light or at night?4N/A
PX111201_Difficulty_Notice_Object_Off_SidePX111201100000Because of your eyesight, how much difficulty do you have noticing objects off to the side while you are walking along?4N/A
PX111201_Difficulty_See_People_ReactPX111201110000Because of your eyesight, how much difficulty do you have seeing how people react to things you say?4N/A
PX111201_Difficulty_Pick_Out_Match_ClothesPX111201120000Because of your eyesight, how much difficulty do you have picking out and matching your own clothes?4N/A
PX111201_Difficulty_Visit_PeoplePX111201130000Because of your eyesight, how much difficulty do you have visiting with people in their homes, at parties, or in restaurants?4N/A
PX111201_Difficulty_Go_OutPX111201140000Because of your eyesight, how much difficulty do you have going out to see movies, plays, or sports events?4N/A
PX111201_Currently_DrivingPX111201150100Now, I'd like to ask about driving a car. Are you currently driving, at least once in a while?4Variable Mapping
PX111201_Never_Or_Gave_UpPX111201150200Have you never driven a car or have you given up driving?4N/A
PX111201_Is_Eyesight_ReasonPX111201150300Was that mainly because of your eyesight, mainly for some other reason, or because of both your eyesight and other reasons?4Variable Mapping
PX111201_Difficulty_Driving_Daytime_Familiar_PlacesPX111201150400How much difficulty do you have driving during the daytime in familiar places? Would you say you have:4N/A
PX111201_Difficulty_Driving_NightPX111201160100How much difficulty do you have driving at night? Would you say you have:4Variable Mapping
PX111201_Difficulty_Driving_Difficult_ConditionsPX111201160200How much difficulty do you have driving in difficult conditions, such as in bad weather, during rush hour, on the freeway, or in city traffic? Would you say you have:4N/A
PX111201_Accomplish_Less_Because_VisionPX111201170000Do you accomplish less than you would like because of your vision?4N/A
PX111201_Limited_Work_Activity_Time_Because_VisionPX111201180000Are you limited in how long you can work or do other activities because of your vision?4N/A
PX111201_Pain_Discomfort_Eyes_Limit_DoingPX111201190000How much does pain or discomfort in or around your eyes, for example, burning, itching, or aching, keep you from doing what you'd like to be doing? Would you say:4N/A
PX111201_Stay_Home_Because_EyesightPX111201200000I stay home most of the time because of my eyesight4N/A
PX111201_Frustrated_Because_EyesightPX111201210000I feel frustrated a lot of the time because of my eyesight4N/A
PX111201_Less_Control_Because_EyesightPX111201220000I have much less control over what I do, because of my eyesight4N/A
PX111201_Rely_Other_People_Because_EyesightPX111201230000Because of my eyesight, I have to rely too much on what other people tell me4N/A
PX111201_Need_Other_Help_Because_EyesightPX111201240000I need a lot of help from others because of my eyesight4N/A
PX111201_Worry_Embarrass_Because_EyesightPX111201250000I worry about doing things that will embarrass myself or others, because of my eyesight4N/A
PX111201_Optional_Overall_Health_Scale_RatePX111201260000How would you rate your overall health, on a scale where zero is as bad as death and 10 is best possible health?4N/A
PX111201_Optional_Eyesight_Scale_RatePX111201270000How would you rate your eyesight now (with glasses or contact lens on, if you wear them), on a scale of from 1 to 10, where zero means the worst possible eyesight, as bad or worse than being blind, and 10 means the best possible eyesight?4Variable Mapping
PX111201_Optional_Difficulty_Read_Small_PrintPX111201280000Wearing glasses, how much difficulty do you have reading the small print in a telephone book, on a medicine bottle, or on legal forms? Would you say:4Variable Mapping
PX111201_Optional_Difficulty_Accurate_BillsPX111201290000Because of your eyesight, how much difficulty do you have figuring out whether bills you receive are accurate?4N/A
PX111201_Optional_Difficulty_Shave_Hair_MakeupPX111201300000Because of your eyesight, how much difficulty do you have doing things like shaving, styling your hair, or putting on makeup?4N/A
PX111201_Optional_Difficulty_Recognize_People_AcrossPX111201310000Because of your eyesight, how much difficulty do you have recognizing people you know from across a room?4Variable Mapping
PX111201_Optional_Difficulty_Sports_Outdoor_ActivitiesPX111201320000Because of your eyesight, how much difficulty do you have taking part in active sports or other outdoor activities that you enjoy (like golf, bowling, jogging, or walking)?4N/A
PX111201_Optional_Difficulty_TV_ProgramPX111201330000Because of your eyesight, how much difficulty do you have seeing and enjoying programs on TV?4N/A
PX111201_Optional_Difficulty_Entertain_Friends_FamilyPX111201340000Because of your eyesight, how much difficulty do you have entertaining friends and family in your home?4N/A
PX111201_Optional_Have_More_Help_Because_VisionPX111201350100Do you have more help from others because of your vision?4N/A
PX111201_Optional_Limited_Do_Things_Because_VisionPX111201350200Are you limited in the kinds of things you can do because of your vision?4N/A