WLS Codebooks

Note: Codebooks contain frequency data from the private data release. For some variables, these differ from the frequencies in the public release. Variables that differ between the public and private versions include "(not available on public release)" as part of the variable description, or a note indicating the difference between the public and private versions.

In Person: Vision Screener

JVIS  Vision Screener Module

OVERVIEW

The Vision Screener Module, which was administered to a randomly selected 15%
sub-sample of participants, is new to the 2010 collection wave. It features a
check of participants' vision using an 11-line Snellen chart much like those
preferred by eye care professionals. Each line on the chart includes different
combinations of letters. Moreover, with each descending line, the number of
letters increases as their (font) size decreases. The vision check is
administered as follows: first, the interviewer sets up an easel; then, the
interviewer places the participant's chair 10 feet away from the easel and
directly facing it; the participant is subsequently invited to sit down in the
chair, after which the Snellen chart is placed on the easel; finally, the
interviewer instructs the participant to "please look at this chart and read
the lowest complete line you can see. While you are doing this activity, please
try to keep your back against the back of the chair [if the chair does not have
a back the participant is asked to sit up as straight as they can]." If the
participant is unable to correctly read the complete line they select, the
interviewer asks them to "please read the line above that one." Conversely, if
the participant correctly reads the complete line they select, the interviewer
encourages them to try reading the line below it. The interviewer continues
prompting the participant to read adjacent lines until the lowest one they can
correctly read is determined. Note that this module was only administered to
members of the sub-sample who were interviewed in person, did not report an
inability to see when asked about their vision in the Health Module, and who
had the use of their hands (the vision check preceded a cognitive task that
involved using a computer keyboard).  


BRIEF VARIABLE DESCRIPTIONS
    _____________________________________________________________________

    HEPRSTAT-HEPRREL:	    Module-Level Status Variables.

    HVI01RE:		    Does Participant Belong to the 15% 
    			    Sub-Sample Selected to Complete the Vision
    			    Screener Module?

    HVI02RE:		    Did Participant Satisfy the Conditions
    			    Necessary to Having Their Vision Screened?
    			    
    HVI03RE:		    Lowest Line on Snellen Chart Participant 
    			    Was Able to Correctly Read
    
    HVI04RER-HVI14RER:	    Participant's Capability for Correctly 
    			    Reading Each of the 11 Lines on the Snellen
    			    Chart

heprstat: Was the Vision Screener Module completed by Participant alone, with help, or by proxy?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: y_rogflag, y_eprproxy1, y_eprhelp0, capiproxy, y_proxy, y_ivwloc

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT ASKED OF PARTICIPANT OVER TELEPHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-4 NOT ASCERTAINED 0 1 1
-2 2324 2720 5044
1 R COMPLETED ALONE 393 432 825
2 R COMPLETED ALONE WITH SOMEONE ELSE IN THE ROOM 46 25 71
Note: For many cases a participant's spouse or other family member was present during the interview. This sometimes resulted in the participant relying on the other person for help in answering some or many of the questions. At the end of each module the interviewer indicated the amount of help the participant received and who provided that help. That assessment is covered by codes 1 through 5. Additionally, a code of 7 indicates that the entire interview was administered to a proxy while a code of 6 indicates that this particular module was answered by a proxy but other modules were answered by the participant.

heprrel: Relationship of Vision Screener Module helper or proxy to Participant.

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HEPRSTAT, y_eprproxy1, y_eprhelp0, y_eprhelp1, y_eprhelp2_hfn, y_eprhelp3, y_h1fn-y_h4fn, y_pfn, prxyfnam, y_p1fn-y_p5fn, y_prel, prxyrel, y_p1rel-y_p5rel

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT ASKED OF PARTICIPANT OVER TELEPHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-4 NOT ASCERTAINED 0 1 1
-2 2763 3177 5940
Note: If this module was administered via proxy or if the participant received help answering the questions in this module then we record the relationship of the proxy/helper to the participant. Although most participants relied on only one helper or proxy for the interview, some had more than one. Thus the value of the relationship code may vary across the modules.

hvi01re: Does Participant belong to the 15% sub-sample randomly selected to complete the Vision Screener Module?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: y_rogflag

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-5 PARTIAL INTERVIEW 3 0 3
1 YES 450 471 921
2 NO 2324 2720 5044

hvi02re: Did Participant satisfy the conditions necessary to have their vision screened?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI01RE, y_x4, y_ivwloc, y_vis1

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT ASKED OF PARTICIPANT OVER TELEPHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2324 2720 5044
1 YES 428 447 875
2 NO 11 11 22
Note: Participants who were part of the sub-sample randomly selected to complete this module did not have their vision screened if any of the following was true of them: (1) in the Health Module, they reported not being able to see at all during the past four weeks; or (2) they did not have the use of their hands.

hvi03re: Lowest line on the Snellen chart Participant was able to read correctly.

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, HVI04RER-HVI14RER

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-3 REFUSED 1 1 2
-2 2335 2731 5066
1 TOPMOST 4 8 12
3 1 3 4
4 11 3 14
5 17 17 34
6 43 52 95
7 82 88 170
8 87 97 184
9 138 134 272
10 25 34 59
11 BOTTOMMOST 19 10 29
Note: Participants who refused the vision screener after beginning but prior to completing it have been assigned a value of "-3" on this variable, signifying "refused."

hvi04rer: Was Participant able to correctly read the first (topmost) line of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_a

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-3 REFUSED 1 1 2
-2 2335 2731 5066
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 423 438 861
2 YES, LOWEST LINE READ CORRECTLY 4 8 12
Note: This line read as follows: "K V D".

hvi05rer: Was Participant able to correctly read the second line from the top of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-b

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 423 438 861
3 NO 4 8 12
Note: This line read as follows: "Z S H C".

hvi06rer: Was Participant able to correctly read the third line from the top of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-c

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 422 435 857
2 YES, LOWEST LINE READ CORRECTLY 1 3 4
3 NO 4 8 12
Note: This line read as follows: "H S K R N".

hvi07rer: Was Participant able to correctly read the fourth line from the top of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-d

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 411 432 843
2 YES, LOWEST LINE READ CORRECTLY 11 3 14
3 NO 5 11 16
Note: This line read as follows: "C H K R V D".

hvi08rer: Was Participant able to correctly read the fifth line from the top of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-e

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 394 415 809
2 YES, LOWEST LINE READ CORRECTLY 17 17 34
3 NO 16 14 30
Note: This line read as follows: "H O N S D C V".

hvi09rer: Was Participant able to correctly read the sixth line from the top of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-f

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 351 363 714
2 YES, LOWEST LINE READ CORRECTLY 43 52 95
3 NO 33 31 64
Note: This line read as follows: "O K H D N R C S".

hvi10rer: Was Participant able to correctly read the seventh line from the top of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-g

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 269 275 544
2 YES, LOWEST LINE READ CORRECTLY 82 88 170
3 NO 76 83 159
Note: This line read as follows: "V H D N K U O S R C".

hvi11rer: Was Participant able to correctly read the eighth line from the top of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-h

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 182 178 360
2 YES, LOWEST LINE READ CORRECTLY 87 97 184
3 NO 158 171 329
Note: This line read as follows: "B D C L K Z V H S R O A".

hvi12rer: Was Participant able to correctly read the ninth line from the top of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-i

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 44 44 88
2 YES, LOWEST LINE READ CORRECTLY 138 134 272
3 NO 245 268 513
Note: This line read as follows: "H K G B C A N O M P V E S R".

hvi13rer: Was Participant able to correctly read the tenth line from the top of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-j

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
1 YES, BUT NOT LOWEST LINE READ CORRECTLY 19 10 29
2 YES, LOWEST LINE READ CORRECTLY 25 34 59
3 NO 383 402 785
Note: This line read as follows: "P K U E O B T V X R M J H C A Z D I".

hvi14rer: Was Participant able to correctly read the eleventh (bottommost) line of the Snellen chart?

Data source: Graduate Participant or Proxy      Collected in: 2011      Mode: In person & telephone
Source variables: HVI02RE, y_vis2_:a-k

Frequencies
Value Label Male Female Total
. System missing - NR 2146 2019 4165
-30 NOT PART OF MOSAQ 68 116 184
-28 NOT RELEVANT TO PARTICIPANT INTVD. BY PHONE 9 10 19
-27 NOT ASKED OF PROXY 2 3 5
-5 PARTIAL INTERVIEW 3 0 3
-2 2336 2732 5068
2 YES, LOWEST LINE READ CORRECTLY 19 10 29
3 NO 408 436 844
Note: This line read as follows: "D K N T W U L J S P X V M R A H C F O Y Z G".
Note: As the bottommost line on the Snellen chart, the 11th one was - by default - the lowest line a participant could have possibly read correctly (within the context of this activity).

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