large cornea
Introduction
Introduction The large cornea is a congenital dysplasia in which the cornea is larger than normal and the intraocular pressure, fundus and visual function are in the normal range. X-linked recessive inheritance. More common in men.
Cause
Cause
More common in men, mostly bilateral, no progress. The transverse diameter of the cornea is >13 mm, the vertical diameter is >12 mm, and the anterior segment of the yin is not proportionally enlarged. The large cornea is transparent and the cornea is clearly defined. A small number of patients may have other abnormalities in the eye, such as iris and pupil abnormalities, or systemic congenital abnormalities such as Marfans syndrome.
Examine
an examination
Related inspection
Ophthalmic examination eye function examination
1. History: Whether there are corneal irritation symptoms and traumatic history, whether corticosteroids have been used locally or systemically, with or without chronic dacryocystitis, varus and other eye diseases and related systemic diseases.
2. Eye examination: If the symptoms are severe, especially in children, the surface anesthetic may be dripped before examination. For those who are at risk of perforation, avoid oppression of the eye when inspecting. The corneal surface damage is easily detected by fluorescein staining, and the corneal lesions and morphology are more easily detected by a magnifying glass or a slit lamp. If necessary, perform corneal sensation examination and tear secretion function check.
Diagnosis
Differential diagnosis
Diagnosis of large cornea should be differentiated from congenital glaucoma, the cornea is large and turbid, the limbus is dilated and the boundary is unclear, with elevated intraocular pressure. The large cornea should be differentiated from the water eye. The former has normal intraocular pressure and visual function, the posterior elastic membrane is normal, the boundary of the cornea is clear, and the width of the limbus is normal.
