A validation study of the vision test battery used in the Health Examination Survey of 1966-1970 was conducted among 210 youths 12-17 years-old who had been part of the larger survey. The study was designed to discover the degree of correspondence between survey test results and clinical examination by an opthalmologist in determining the…

As follow up to a study which compared forced-choice preferential looking (FPL) with pattern visual evoked potential (VEP), this study increased the VEP success rate and improved agreement between the FPL and VEP acuity estimates by using horizontal bar stimuli for young preverbal children (n=17) with nystagmus. (Author/DB)

The Parsons Visual Acuity Test (PVAT) described in the article has been developed for use with difficult-to-test individuals previously labeled untestable. The studies reported support use of the PVAT as an alternative screening procedure for identifying difficult-to-test persons who are in need of a professional eye examination. (Author/CL)

A vision screening program established at a facility for 271 individuals with severe or profound mental retardation used the acuity card procedure as its measure. The procedure was found to be a valid and reliable screening tool for this population. A few residents had good visual acuities, whereas the acuities of others were poor. (JDD)