Serdiuchenko Vira
Filatov Institute of Eye Diseases and Tissue Therapy, Ukraine
Title: Modified device for investigation of accommodation; irregular accommodation
Biography
Biography: Serdiuchenko Vira
Abstract
A device for studying the volume of absolute accommodation (VAA) of the eye is known - the two-point diaphragm of Scheiner
(1619), based on the principle of monocular diplopia, that allows to study this index quite accurately. However, it has some drawbacks: reduced illumination of the pupil; narrow field of view; if one of the holes is not projected onto the pupil, then the phenomenon of monocular diplopia is not caused. The aim of the work was to make a device that would eliminate the existing shortcomings of the Scheiner diaphragm. The modified device is a disk with a diameter of 38 mm from an opaque material, in the center of which there is a depression with the bottom. The bottom is a lattice with parallel slots and bridges of the same width. Advantages of this device in comparison with the diaphragm of Scheiner are the following: the illumination of the pupil increases; the field of view is widened to 80-90 degrees; when the lattice is shifted, its function does not disappear, because in the projection of the pupil there are 2 or 3 slots, which allows provoking the phenomenon of monocular diplopia. The test-object is a thin line on a light background. Using this device, VAA was studied in preschool and schoolchildren. It is shown that from 3 to 7 years the VAA increases (from 7.4±0.1 dptr to 10.3±0.06 dptr), and then (to 15 years) gradually decreases (to 7.3±0.05 dptr). The installation of slots and test-object in this or that meridian allowed proving the possibility of irregular accommodation of the eye. The modified device is an accurate and convenient device for investigating VAA.