In the visual acuity test, how is the testing conducted?

In a visual acuity test, the proper method of testing is to evaluate each eye individually, known as monocular testing. This approach allows the examiner to determine the vision of each eye without influence from the other. By conducting the test monocularly, it provides clear, accurate results for each eye, which is crucial for diagnosing any vision impairments or differences in visual acuity.

Testing both eyes simultaneously or using alternating vision may lead to varied results because one eye could compensate for the weakness in the other. Covering both eyes would altogether prevent any assessment of visual acuity, as the individual would not be able to see at all. Monocular testing is thus the standard practice ensuring that each eye is assessed accurately on its own merits, leading to a precise understanding of an individual's visual capabilities.