J Korean Ophthalmol Soc.  2003 Aug;44(8):1859-1864.

Prism Diopter for Unconformity between the Optical Center and the Pupil Center

• Lee YD
• Lee YI
• Bae SR

Abstract

PURPOSE
To investigate the effect of the difference between interoptical and interpupillary center distance on the eye of the patient. METHODS: One hundred patients were enrolled in this study. We investigated the congruities between interpupillary and interoptical center distance, the horizontal balance of optical center, and the induced prismatic effects. RESULTS: Prismatic effects were evaluated for 30 patients who were wearing inaccurate lens centering. The average of P.D in male (64.2+/-2.7 mm) was greater than that in female (61.2+/-2.2 mm). The evolution of the induced horizontal phoria showed that forty-seven percent of the patients had induced exophoria and fifty-three percent of the patients had induced esophoria. The prism diopter of the induced exophoria and esophoria were 0.92+/-0.87delta and 0.62+/-0.46delta, respectively. CONCLUSIONS: When the pupillary distance of or the interpupillary distance was not accurately measured, the prism effect and the induced phoria developed by the difference between interoptical and interpupillary center distance.

Keyword

Ophthalmic dispensed glasses; Prismatic effects; Pupillary distance

MeSH Terms

Esotropia
Exotropia
Female
Humans
Male
Pupil*
Strabismus