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schirmer's test rhodopsin phototransduction syringing silicone hydrogels hydrogels rigid gas permeable arc tests for stereopsis monocular cues retinal rivalry developmental stages of bsv pre-requisite for bsv grades neural aspects theories blink response maintenance of transparency silicone elastomers pmma phema cab disposable lenses nomenclature classification types of contact lenses advantages and disadvantages indications contraindications direct tonometer indirect tonometer applanation tonometer stye chalazion ectropion lagophthalmos ptosis dermatochalasis symblepheron proptosis unilateral proptosis - bilateral axial and non-axial proptosis grave's disease orbital cellulitis evaporative dry eye aqueous deficiency dry eye epiphora tear break up time jone's dye test bacterial conjunctivitis viral conjuctivitis trachoma gpc chlamydial conjuctivitis atopic keratoconuctivitis pterygium pinguicula concretions corneal layers cells in each layer a-scan b-scan ubm optical biometry color vision deficiencies protonopia duetranopia achromatopsia ishihara psuedoisochromatic lantern test d-15 test 100-hue test dye disappearance test nitbut tbut phenol red thread test chief complaints ocular history previous medical history general medical history history of medication history of allergies pediatric and birth history various differential diagnosis history with mnemonics layer of the retina ii-cis retinol 11 trans-retinol opsin vitamin a nerve supply indentation tonometer non contact tonometer manual automated lens guage prisms infective keratitis non infective keratitis corneal dystrophies corneal ectasias corneal degenerations layers of retina 11 cis retinol 11 trans retinol lipid layer aqueous layer mucin layer nasolacrimal duct lacrimal sac canaliculai punctum blink movement lacrimal pump mechanism physiological nystagmus pathological nystagmus end gaze nystagmus optokinetic nystagmus congenital nystagmus acquired nystagmus