Measurements of the Diameter and Area of the Optic Disc.

Park, Jong Seok; Ko, Myung Kyoo; Choe, Joon Kiu

Original Article

Journal of the Korean Ophthalmological Society 1991;32(10):898-902.
Published online October 1, 1991.

Measurements of the Diameter and Area of the Optic Disc.

Jong Seok Park, Myung Kyoo Ko, Joon Kiu Choe

Department of Opthalmology, School of Medicine Hanyang University, Korea.

시신경유두의 직경 및 면적측정

박종석(Jong Seok Park),고명규(Myung Kyoo Ko),최준규(Joon Kiu Choe)

Abstract

Using Littmann's method for correcting the magnification of central fundus photographs, we evaluated the color photographs of 195 optic discs to measure the diameter and area of the optic disc. Minimal disc diameter ranged from 1.30mm to 2.53mm(mean 1.81mm) and maximal diameter from 1.53mm to 3.08mm(mean 2.04mm). Mean optic disc area measured 2.93mm2(minimum 1.63mm2, maximum 5.53mm2). The correlation coefficients between the refractive diopter of right eye and the disc diameter of right eye were 0.34 and between the refractive diopter of left eye and the disc diameter were 0.42. The correlation coefficients between the disc area and the refractive diopter were 0.43. There was no statistically significant difference in each optic disc diameter. Regarding the Gaussian distribution curve based on these preliminary data, microdiscs can be defined as being smaller than 1.57mm2(mean minus two standard deviations) and macrodiscs as being larger than 429mm2(mean plus two standard deviations).

Key Words: area, diameter;Littmann's method;optic disc