Optometry alternating cover test method

A. open eyes, both eyes mist as the +0.75DS, the vision about 0.6 per cent

B. alternate cover your eyes, allow patients to look at 0.5 line sign, the clarity of the eyes are the same:

① If clarity, the same eyes two, that eyes have balance.

II if the clarity of the eyes are not the same, is clear and +0.25DS mist mirrors, fuzzy eyes blurring so that it is more of the same. Repeated adjustment until the eye is also vague, stating that my eyes have balance.

C. eyes synchronized equivalent increased -0.25DS and observe the changes of Visual acuity, -0.25DS vision of at least one row for each additional, and best vision most of the eyes are the mirror of the end.