FIELD: medicine; ophthalmology. SUBSTANCE: apparatus has light source, plate carrying groups of equal-size characters, data converter with memory unit, display unit, and instruction generating unit. Mentioned units are connected to data converter for sequential illumination of character group. Light source is made in the form of light- emitting array each emitter being connected through power unit to data converter output; data converter has optical system placed in immediate proximity of eye under test. Apparatus is designed for varying distance between plate and optical system and has measuring scale. EFFECT: simplified design, enlarged functional capabilities. 10 cl, 4 dwg
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