Less than one percent of the respondents refer students for a two-line difference and no respondents note failure to perform the test as a reason to refer a student. Near Vision Near vision screening is recommended at 1st and 3rd grades. Twenty-nine percent only screen for near vision if a student has a vision concern, not at any specific grade level. The screening instrument recommended for near vision is the Plus Lens Test. Table 3 below shows the instruments used for near vision screening by the respondents.
Some respondents report using a combination of instruments.
Near vision referral criteria are when the child is able, using the plus lens, to see clearly greater than two lines beyond distance acuity performance. Color Vision Color vision screening is recommended only once while in school and is to be done in 3rd grade. Thirty-five percent of the schools screen for color vision only if a student has a vision concern, not at any specific grade level. Instruments used by respondents for screening color vision. To pass screening the child must be able to read 8 of 11 plates.