Patent ID: 10791921

Abstract:
To realize highly reliable examination by means of an apparatus free of troublesome adjustment of which structure as a whole is simple. The examination contributes to early discovery of glaucoma in particular. Light emitted from a matrix-type light-emitting diode unit 12 is projected onto an eye to be examined through a liquid crystal shutter 16 and a main optical system 14. The matrix-type light-emitting diode unit 12 includes a plurality of light-emitting diodes devices 12b, 12b, 12b, of the same specifications arranged in a matrix array. The light-emitting diode devices 12b, 12b, 12b are independently controlled to form an image for use in the examination. The image includes a circular visual target 100a and a background 100b which is a remaining portion of the image. The visual target 100a flickers generally sinusoidally at a frequency between 1 Hz and 200 Hz. With this arrangement, highly reliable examination contributing to early discovery of glaucoma is realized. The structure of the apparatus as a whole is simple, and no troublesome adjustments are required.