What is central serous retinopathy?
Central Serous Retinopathy (CSR) is an eye condition in which fluid accumulates beneath the retina, resulting in a localized detachment of the retinal pigment epithelium (RPE). This fluid buildup is caused by fluid leakage from...
What is central retinal vein occlusion?
Central Retinal Vein Occlusion (CRVO) is a common vascular disorder of the retina characterized by a blockage of the central retinal vein, which drains deoxygenated blood from the retina. This occlusion causes pressure to...
What is vitreous neovascularization?
Neovascularization of the vitreous is the abnormal formation of new blood vessels within the vitreous body, which is a gel-like substance that fills the eye between the lens and the retina. This condition is frequently the...
What is neovascular glaucoma?
Neovascular glaucoma is a severe and vision-threatening type of secondary glaucoma characterized by the formation of abnormal new blood vessels on the iris and drainage angle of the eyeball. This abnormal neovascularization prevents the normal outflow...
What is necrotizing scleritis?
Necrotizing scleritis is a rare but severe inflammatory condition affecting the sclera, the white outer layer of the eye. This condition is characterized by progressive tissue necrosis and can cause severe pain and vision loss. Necrotizing...
What is Nasolacrimal Duct Obstruction?
Nasolacrimal duct obstruction (NLDO) is when the nasolacrimal duct, which drains tears from the eye into the nasal cavity, becomes clogged. This causes excessive tearing (epiphora), which can result in recurring eye infections or inflammation....
What is myopic maculopathy?
Myopic maculopathy, also known as myopic macular degeneration, is a serious complication of high myopia that can cause vision loss. High myopia is defined as a refractive error of more than -6.00 diopter. The progressive elongation...
What is central retinal artery occlusion?
Central retinal artery occlusion (CRAO) is a serious and vision-threatening condition characterized by a sudden blockage of the central retinal artery, which supplies blood to the retina. This blockage causes a sudden and painless...
What is cataract?
A cataract is a clouding of the eye's natural lens, located behind the iris and pupil. This condition is a leading cause of vision impairment and blindness worldwide, primarily affecting the elderly. Cataracts form when proteins in...
What is Capsular Opacification?
Capsular opacification, also known as posterior capsular opacification (PCO), is a common complication of cataract surgery. It occurs when lens epithelial cells left behind during cataract extraction proliferate and migrate across the lens implant's posterior capsule....
What is Capillary Hemangioma of the Orbit?
Capillary hemangioma of the orbit, also known as infantile hemangioma, is a benign vascular tumor that typically affects infants and young children. This condition causes the proliferation of capillary blood vessels, resulting in...
What exactly is Canaliculitis?
Canaliculitis is a rare but significant infection of the canaliculi, which are small channels in the eyelids that drain tears from the eye into the lacrimal sac. Bacterial, fungal, or viral infections are frequently responsible for...
What is myopia?
Myopia, also known as nearsightedness, is a common refractive error that causes distant objects to appear blurry while close objects are clearly visible. This condition occurs when the shape of the eye causes light rays to bend...
What is Multiple Sclerosis Ocular Issues?
Multiple sclerosis (MS) is a chronic autoimmune disease affecting the central nervous system, resulting in a variety of neurological symptoms. Ocular issues are among the most common and can have a significant impact on...
What is MEWDS (Multiple Evanescent White Dot Syndrome)?
Multiple Evanescent White Dot Syndrome (MEWDS) is a rare, self-limiting inflammatory eye condition that primarily affects young adults, with women having a higher incidence. MEWDS is characterized by the sudden onset of...
What is multifocal choroiditis and panuveitis (MCP)?
Multifocal Choroiditis and Panuveitis (MCP) is a rare, idiopathic inflammatory eye disease that affects the choroid, retina, and vitreous. MCP, which is characterized by the presence of multiple, small, yellowish-white lesions in the...
Definition of Mucoepidermoid Carcinoma of the Lacrimal Gland
Mucoepidermoid carcinoma of the lacrimal gland is a rare and aggressive malignant tumor that develops from the epithelial cells of the lacrimal gland. The lacrimal gland, which is located in the upper...
What is bullous keratopathy?
Bullous keratopathy is a painful ocular condition in which fluid-filled blisters (bullae) form on the cornea, the clear, dome-shaped surface that covers the front of the eye. This condition results from endothelial cell dysfunction, which impairs...
What is Branch Retinal Vein Occlusion?
Branch retinal vein occlusion (BRVO) is a common vascular disorder affecting the retina, the light-sensitive tissue located in the back of the eye. This condition develops when one of the smaller branches of the...
What is branch retinal artery occlusion?
Branch retinal artery occlusion (BRAO) is a serious ophthalmic condition characterized by the blockage of one of the smaller arteries that branch off from the central retinal artery. This blockage causes a sudden and...
What is Blue Sclera?
Blue sclera is a condition that causes the sclera, the white part of the eye, to appear unusually bluish. This distinct appearance results from scleral tissue thinning, which makes the underlying blue uveal tissue more visible....
What is a blowout fracture?
A blowout fracture is a traumatic injury to the orbit, the bony socket that surrounds the eye. This condition is typically caused by blunt force trauma, such as a punch or ball impact, and involves...
Definition of Mucoepidermoid Carcinoma of the Lacrimal Gland
Mucoepidermoid carcinoma of the lacrimal gland is a rare and aggressive malignant tumor that develops from the epithelial cells of the lacrimal gland. The lacrimal gland, which is located in the upper...
What is Migraine With Aura (Ophthalmic Migraine)?
Migraine with aura, also known as ophthalmic migraine, is a neurological disorder characterized by recurrent headaches and visual or sensory disturbances known as auras. These auras usually occur before the headache phase and...
What is a microstrabismus?
Microstrabismus, also known as microtropia, is a subtle type of strabismus characterized by a very slight misalignment of the eyes, usually less than 5 degrees. This small-angle deviation frequently goes unnoticed without specialized examination. Despite its...
What is microphthalmia?
Microphthalmia is a congenital ocular condition in which one or both eyes are abnormally small and malformed. This condition can range in severity from slightly smaller-than-normal eyes to severely underdeveloped eyes, and it is sometimes associated with...
What is Melanoma of the Eyelid?
Melanoma of the eyelid is a rare but potentially fatal cancer that arises from melanocytes, the pigment-producing cells in the skin. This cancer accounts for only a small percentage of all skin cancers, but...
What is Melanocytoma of the Optic Disc?
Melanocytoma of the optic disc is a rare, benign pigmented tumor that develops near the optic nerve head. These tumors are typically dark brown to black in color due to their high melanin...
What is blepharospasm?
Blepharospasm is a neurological condition characterized by involuntary, repetitive spasms or contractions of the eyelid muscles, which cause frequent blinking and eye closure. This disorder, which belongs to the larger category of focal dystonias, primarily affects the...
What is blepharochalasis?
Blepharochalasis is a rare chronic eyelid disorder that causes recurrent episodes of painless swelling of the eyelids. These episodes cause the skin on the eyelids to thin, stretch, and wrinkle, giving the eyes an aged or fatigued...
