OCULAR SYSTEM Russian patent published in 1997 - IPC

FIELD: optical instrumentation engineering. SUBSTANCE: ocular system has first single lens made as meniscus facing the entrance pupil with its concavity, second single positive lens with aspherical surface facing the exit pupil surface, third lens glued of negative and positive lenses, fourth negative lens glued of positive and negative lenses, and fifth auxiliary single negative lens positioned behind fourth negative lens. All the above-indicated lenses are positioned in succession along optical axis from entrance pupil surface. EFFECT: more effective examination. 1 dwg, 7 tbl