Ideally at 2.5 to 3yrs of age. At any case it should be before the age of 5 years. Certain problems such as unequal spectacle number or a number only in one eye can be detected by the doctor even at that age and rectified by correct glasses or even a contact lens in one eye if there is a number only in that eye. This will prevent the development of a “lazy” eye. Remember the doctor does not need the co-operation of the child. It is also not necessary that the child know how to read the alphabet to test for spectacle numbers!
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