Description

For sample children, VDIFDISTANCE indicates whether individual needs glasses or contacts "to read road and street signs, see the blackboard, play sports, watch TV, or see things in the distance." Please see the Universe tab for more information on changes in universe over time.

This variable is included in the Sample Child Vision Supplement, sponsored by the National Eye Institute.

Comparability

There are notable differences in universes which must be accounted for to properly compare this variable over samples. See the Universe tab for details.

In addition to changes in universe, the NHIS questionnaire was substantially redesigned in 2019 to introduce a different data collection structure and new content. For more information on changes in terminology, universes, and data collection methods beginning in 2019, please see the user note.

Universe

Availability

• 2008, 2016-2017, 2023

Weights

• 2008, 2016-2017, 2023 : SAMPWEIGHT