6. Monocular testing

In order to learn whether visual acuity is symmetric, the eyes need to be tested in turn while the other eye is covered. As a cover we can use a "pirate's patch", which is not always well accepted, or a soft tissue folded to a triangle. The non-dominant left eye with higher plus glass is covered first and the dominant right eye second.

“Now you are like a brisk school girl.”
“What do we have here?” (Barely audible answers, both correct: "Ball." and "Heart".)
The right, dominant eye is covered – no reaction.
“What do we have here?” "Ball."

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