prism diopter


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Related to prism diopter: prism dioptre

prism diopter

[′priz·əm dī′äp·tər]
(optics)
A unit used in measuring the deviating power of a prism; this power in prism diopters is 100 times the tangent of the angle of deviation of a ray of light.
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The outcome measures were the near lateral and vertical phorias in prism diopters (PDs) in each of the nine gazes.
rectus inferior 1.92-2.27 (b,c) 3.49 (b,c) (a) Not specified if angle at near fixation or distance, degrees converted to prism diopters (rate: [degrees]/0.5729); (b) with prior decompression; (c) Eckstein, Schittkowski et al.
At 1 month the mean deviation was 6.58 prism Diopters and 3 months the mean deviation was 5.59 prism Diopters.
The patient had esotropia of 40 prism diopters and right eye abduction was graded as -4 (completely limited).
Sener and Sanac (56) administered BoNT to 25 esotropia patients (mean of 1.6 injections) and 45 exotropia patients (mean of 1.6 injections) with a deviation angle of about 38 prism diopters in both groups.
The angle of preoperative and postoperative deviations were assessed by Hirschberg test, Krimsky test or alternate prism cover test (in prism diopters [PD]) when possible.
They defined surgical success as [less than or equal to] 10 prism diopters and found that in sensory strabismus, good visual acuity was associated with higher surgical success in the long term.