Details of Element: Type of Vision
Component of Vision-Color-Tonography

Unique Name: tyofv
Contained in the Common BLSA Data Set ? Yes

Data Points (as of 09/06/98) Males Females Total
Number of Data Points 5001 1578 6579
Number of Distinct Participants 1249 606 1855
Year First Collected 1964 1978 -
Year Last Collected 1992 1992 -

Type of Variable: Absolute Measure
Encoding: Discrete
    Value Meaning
    0 Farsighted
    1 Nearsighted
    2 Both
    3 Neither
Precision: #.
Anticipated Range: 0. thru 3.
Masterfile Index: 611-01-04
Related Data Elements: none
Specific to this Data Element:
    Inclusion/Exclusion Rules: n/a
    Descriptive History: (none)
Details for this Data Type
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