Estimation of visual acuity
Examinee differentiates places of interrupter in Landolt’s rings from the distance 5 m. Calculate visual acuity according to formula:
VA=d/D, where d – distance, from which examinee see clear test object; D – distance, from which normal eye should see clear this test-object (take from test table).
Note in conclusion do result normal or not.
Normal visual acuity measured by Roth apparatus equals 1,0.
