. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. ria alternating withorthophoria, or heterophoria alternating withsquint; or squint alternating with also find variations such as a squint fornear and a heterophoria or orthophoria fordistance; or a heterophoria for near and or-thophoria for distance; or a constant squintfor near and an intermittent squint for dis-tance, etc. Again, a deviation may be period-ic, in that its amount for distance may greatlyexceed that for near, or vice versa. Opposed to a periodic deviation is onewhich is prese
. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. ria alternating withorthophoria, or heterophoria alternating withsquint; or squint alternating with also find variations such as a squint fornear and a heterophoria or orthophoria fordistance; or a heterophoria for near and or-thophoria for distance; or a constant squintfor near and an intermittent squint for dis-tance, etc. Again, a deviation may be period-ic, in that its amount for distance may greatlyexceed that for near, or vice versa. Opposed to a periodic deviation is onewhich is present, and in about equal amount,both for distance and near. Such a deviation,whether squint or heterophoria, is called^continuous. 3. Alternating and Uniocular Squint: Analternating squint is one in which when botheyes are uncovered, so that both have a chanceto fix; sometimes the right eye will deviate,sometimes the left. In uniocular (less proper-ly monocular) squint, under the same condi-tions, one eye, either the right or the left, al-ways fixes and the other always deviates. [Ill]. Refraction and Muscular Imbalance A uniocular squint is denoted as right or left,according to whether it is the right or left eyewhich deviates. 4. Comitant and Non-Comitant Devia-tions: In some varieties of heterophoria andsquint, the amount of deviation is the same inall directions of the gaze, so that the anglebetween the visual line of one eye and that ofthe other remains the same, no matter whichway the eyes are turned. Such deviations arecalled comitant or non-comitant, because oneeye accompanies and keeps pace with theother in all its movements. In other cases,the deviation changes as the eyes are movedin different directions, so that the angle be-tween the two visual lines constantly deviations are termed in a non-comitant squint the angle ofdeviation increases in a regular way as the eyesare moved in one direction and decreases asthey move in the direction
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