|
KMID : 1011420140190040527
|
|
Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 4 p.527 ~ p.532
|
|
|
Induced Prisms of Wearing Glasses Measured by Photographing
|
|
Shin Hyung-Sup
Jang Jun-Kyu
|
|
|
Abstract
|
|
|
Purpose: The matching of the optical center and the pupil center was measured by photographs in wearing glasses. In this study, the influences of the induced prism by the mismatching are studied.
Methods: 74 subjects (148 eyes) who were spectacles wearer were participated in this study. The mean age was 29.19±12.22 years (range 19-55 years). The facial photographs of subjects were taken while wearing spectacles. The matching of the corneal reflected image and optical center of the spectacle lens in the horizontal deviations, and the vertical deviations were measured by the observation of the photo image. The prisms induced in accordance with various
frame type were calculated from the mismatching deviations.
Results: The binocular horizontal deviations were 1.55±1.70 mm for the metal frame, 1.71±2.21 mm for the clings type plastic frame, and 1.15±1.38 mm for the plastic frame. In the horizontal direction induced prism, the ratio over the tolerance was 23%. The ratio were the 17.6% at the BI prism, and 5.4% at the BO prism. The binocular vertical deviation comparisons were 3.93±1.91mm for the metal frame, 5.79±1.93 mm for the clings type plastic frame, and 16.01±2.94 mm for the plastic
frame. In the vertical direction induced prism, the ratio over the tolerance was 44.6%. Based on the refraction power, the ratio were 12.2% at ?0.25
Conclusions: The induced prisms in the horizontal direction were much in the BI prism. The binocular vertical deviations of the glasses with plastic frame were larger than metal frame. The prism induced by the glasses of high refraction power were greater. Measuring the pupil position and the optical center at the same time by a Photography method can evaluate directly the induced prism of the wearing glasses.
|
|
|
KEYWORD
|
|
|
Photography, Corneal reflection point, Optical center, Induced prism
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|