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

KVIS  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
    _____________________________________________________________________

    KEPRSTAT-KEPRREL:	    Module-Level Status Variables.

    KVI01RE:		    Does Participant Belong to the 15% 
    			    Sub-Sample Selected to Complete the Vision
    			    Screener Module?

    KVI02RE:		    Did Participant Satisfy the Conditions
    			    Necessary to Having Their Vision Screened?
    			    
    KVI03RE:		    Lowest Line on Snellen Chart Participant 
    			    Was Able to Correctly Read
    
    KVI04RER-KVI14RER:	    Participant's Capability for Correctly 
    			    Reading Each of the 11 Lines on the Snellen
    			    Chart

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