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1. ultraviolet rays can damage the cornea and retina, and when the eye receives too much light, it naturally shrinks the iris. high-quality sunglasses can filter out up to 97% of the light entering the eye to avoid damage. 1. children: the visual function of children under the age of six has not yet developed to a normal level; new horizons eye hospital said that wearing sunglasses for a long time will affect the visual development of children, and may even lead to amblyopia. 5. retinitis: wearing sunglasses will aggravate the conduction disorder of the optic nerve in patients with optic nerve retinitis and affect the recovery of the disease..syi