When testing visual acuity for the right eye, which eye should be occluded?

When testing visual acuity for the right eye, the left eye should be occluded to prevent it from compensating for any deficiencies in the right eye's vision. This approach ensures that the measurement reflects the visual acuity of the right eye alone, allowing for an accurate assessment of its performance.

Occluding the left eye allows the optometrist or technician to isolate the vision in the right eye, thereby identifying any issues, such as refractive errors or other visual impairments. It is a standard practice in visual acuity testing to assess each eye individually, and this method helps to provide a clearer understanding of a patient's overall visual capabilities.