Vision defects arise from issues with the eye's refractive system (cornea, lens) or the ability of the ciliary muscles to adjust focus, or problems with the retina or optic nerve. Astigmatism specifically relates to the shape of the refractive surfaces.
The defect of vision 'Astigmatism' occurs, when –
Asked in Head Master Praveshika School (Sanskrit Edu.) 2021 · Topic: Optics (Optical Instruments: microscopes, telescopes, human eye)
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