Coloboma is a Greek word, which stands for ‘curtailed’. A Coloboma or space in the eye is formed when an eye which develops quickly through the first three months of growth forms a gap known as fissure. Normally, a fissure is formed at the bottom of the stalks that later forms an eye and the fissure closes during the 7th week of gestation. But when it does not close, which rarely happens, then Coloboma is formed. Coloboma can simultaneously affect both the eyes or may affect only one. This rare eye disease exists in different forms – eye Coloboma refers to a condition in which upper or lower eyelid is missing. Lens Coloboma is a rare eye condition in which a piece of lens in missing. Apart from these there are other forms such as Macular Coloboma, Optic Nerve Coloboma, Uveal Coloboma, and Chorio-retinal Coloboma. This rare eye disease certainly deserves a spot on our list of ten rarest eye diseases you must know about.
what is glaucoma?Glaucoma refers to a group of eye conditions that occur as a result of damaged optic nerves. The optic nerve, as most of you may already know, is responsible for the transference of visual information to the brain, which eventually makes it possible for you to see. Damage to optic nerves occurs as a result of high pressure inside the eye. This could lead to partial or complete blindness. Aqueous humor is the fluid of the eye that is continuously formed. The fluid fills the front of the eye and goes out through cornea and iris. If the ways to go out are blocked, then natural pressure of the eye shoots up. And eventually damages the optic nerves causing the rare eye condition of Glaucoma, which we have included it here on our list of ten rarest eye disorders you must know about.