Cataracts generally do not cause eye redness, except for the over-ripe stage of cataracts, which can cause secondary glaucoma, and high intraocular pressure, which can cause eye redness. Cataracts are only a clouding of the lens, and the biggest manifestation is blurred vision. As the lens becomes cloudy with age, the blurred vision gradually worsens. This is a special period. Cataracts need to be operated at an early stage, do not wait for secondary glaucoma to operate, the effect is not good, the reaction is heavy and the recovery time is long.