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- [23] PRE- POST YAG TREATMENT OF SECONDARY CATARACTS AS A MODEL OF DISCRETE MEDIAL OPACITIES AND THEIR EFFECT ON THE VISUAL-SYSTEM COMPARING VISUAL-ACUITY, CONTRAST SENSITIVITY AND CONTRAST TRANSFER RATIO (CTR) USING AN OCULAR PHOTOMETER (OPM) INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE, 1992, 33 (04) : 1301 - 1301