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cornea contact lens flare aqueous cells parallelopiped sclerotic scatter retroillumination indirect direct illumination technique filter biomicroscopy slitlamp neutralization hyperopia myopia jack c. copeland streak working lens spot retinoscopy retinoscope tonometer schiotz applanation tonometer cornea power corneal curvature eyewear optics physics prognosis case study icga ffa oct retina treatment symptoms signs armd cme vascular serous drusenoid irf ped abrasion ulcer vision bandage amblyoscope stereopsis fusion smp grades of binocular single vision muscular imbalance adduction abduction ipd synoptophore