What does big black eyes mean?

Black eyes generally refer to cornea, cornea has several possibilities: First, large cornea refers to cornea transverse diameter greater than or equal to 13 mm, corneal curvature radius normal, is a family genetic disease, male common, clinically more for both eyes, vision can be normal or accompanied by myopia, astigmatism, etc., generally without special treatment, such as accompanied by myopia, astigmatism and other refractive errors, can be given optical correction. Second, the cornea should pay special attention to whether it is congenital glaucoma, congenital glaucoma is due to embryonic development abnormalities, so that the angle structure congenital abnormalities, or residual embryonic tissue blocking aqueous humor drainage channel, resulting in increased intraocular pressure, the whole eyeball is constantly increasing, also known as water eye or developmental glaucoma, when the intraocular pressure increases, can cause optic nerve fiber damage, resulting in visual field defects, vision decline, serious can cause blindness.