154A Snellen test chart is used to measure the distance of visual acuity. The test distance is six metres.

154     A Snellen test chart is used to measure the distance of visual acuity. The test distance is six metres.

155     The near vision is measured using a LogMar reading card. If Near Snellen, Jaeger, Sloan or Roman reading cards are used the results need to be converted to LogMar (see Figure 6-B: Revised LogMar equivalent for different reading cards). The distance in the near reading test is not fixed: the reading distance should be recorded by the ophthalmologist.

156     Central vision should be tested and recorded for distant and near objects. The employee should be refracted and tested with loose lenses, phoropter, or with their own glasses, provided their correction is accurate.

157     If an employee wears contact lenses each day and wishes to wear them for the test, this is acceptable for measuring acuity. In certain ocular conditions (particularly in the presence of corneal abnormalities) contact lens-corrected vision may be better than that obtained with spectacle correction. However, if an employee does not already wear contact lenses, they should not be fitted for an impairment assessment.

Figure 6-B: Revised LogMar equivalent for different reading cards