Corneal dry spots are dry corneal spots that form due to the accumulation of corneal epithelium and are seen primarily in vitamin A deficiency diseases. This disease is the ocular manifestation of systemic nutritional disorders and vitamin A deficiency. Patients need to do the following examination items: 1, intraocular pressure The pressure inside the eyeball, referred to as intraocular pressure. It is the equalized pressure exerted by the contents of the eye on the wall of the eyeball. The intraocular pressure of normal people is stabilized within a certain range to maintain the normal shape of the eyeball and the visual function of the eye. The range of normal intraocular pressure is 1.47 to 2.79 kPa (11 to 21 mmHg). Intraocular pressure detection methods mainly include finger-measured intraocular pressure method and tonometer measurement method. 2, vitamin content Vitamins, also known as vitamins, in layman’s terms, that is, life-sustaining substances, is a class of organic substances necessary to maintain human life activities, but also to maintain the health of the body’s important active substances. The content of vitamins in the body is very small, but indispensable.