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We discussed the article by Cobb et al1 with great interest in our journal club meeting. We would like to highlight some of the issues we discussed.
Evidence in the literature2,3 suggests anisometropia is a difference of 1 DS between both eyes but the authors use a difference of 2 DS. Also the minimum criteria for diagnosing amblyopia on a test of visual acuity are accepted to be two lines difference between the eyes on linear tests. However, the authors use these criteria for the single optotype test and do not take into account the crowding effect. A two line difference on Sheridan Gardiner may actually equate to a three line difference on a linear test.2 The Royal College of Ophthalmologists3 also state that on repeated testing a difference of one line can also be included—that is, …