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management ophthalmology complications patient infection intraocular anisometropia stereo acuity visual acuity glasses strabismus pediatric amblyopia cornea permeability visual device contact lens retinoscope presbyopia cylinder abberation astigmatism hypermetropia myopia sixth cranial nerve palsy preventable blindness fitting process uses design history types of scleral contact lens objective subjective common dry eye assess tests meditation stem cell new drugs glaucoma surgery eye soft rigid bcl fumigation care scrubbing operation theater trachoma