Twenty-three subjects were tested with American Optical's Non-Contact Tonometer under four randomly-sequenced conditions: 1) before and after reading for ten minutes through a +2.00D add; 2) before and after reading for ten minutes through a plano add; 3) before and after reading through a -1.00D add; and 4) before and after a ten minute period during which the subject sat relaxed with a plane add and fixated normally. The mean change in IOP for each of the four conditions was analyzed using a one-tailed analysis of variance and revealed no significant differences among any of the means. Results were discussed with relation to the findings of Armaly and Burian (1958), and Armaly and Rubin (1961).
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