What is glaucoma?
Glaucoma is a group of eye conditions that harm the optic nerve, which is essential for clear vision. Abnormally high intraocular pressure (IOP) is a common cause of this damage. Glaucoma is a leading cause of blindness...
Definition of Functional Lacrimal Duct Obstruction
Functional lacrimal duct obstruction (FLDO) is a condition in which tears cannot drain properly through the nasolacrimal duct, resulting in excessive tearing (epiphora) and recurring eye infections. In contrast to anatomical obstructions, which involve...
What is fungal keratitis?
Fungal keratitis is a serious and vision-threatening infection of the cornea, the transparent front part of the eye, caused by a variety of fungi. This condition is frequently caused by eye trauma, particularly from organic matter...
What is pleomorphic adenoma of the lacrimal gland?
Pleomorphic adenoma of the lacrimal gland, also known as benign mixed tumor, is the most common benign epithelial tumor in the lacrimal gland. This condition primarily affects the eye's orbital region, which...
What is Pinguecula?
Pinguecula is a non-cancerous growth that develops on the conjunctiva, the clear, thin tissue that covers the white part of the eye (sclera). This condition is distinguished by a small, yellowish bump that usually appears on the...
What is pigmentary glaucoma?
Pigmentary glaucoma is a type of secondary open-angle glaucoma caused by pigment granules dispersed throughout the eye. These granules, which normally reside in the iris, escape into the aqueous humor and can clog the trabecular meshwork....
What is photophobia?
Photophobia, which comes from the Greek words "photo" (light) and "phobia" (fear), is an ocular condition characterized by an abnormal sensitivity to light. Individuals with photophobia feel discomfort or pain when exposed to light, which can range...
What Is a Foreign Body in My Eye?
A foreign body in the eye is any object or substance that enters the eye from outside and may cause irritation, injury, or infection. Common examples include dust, sand, metal shavings, wood...
What is eyelid squamous cell carcinoma?
Eyelid squamous cell carcinoma (SCC) is a malignant tumor that develops from squamous cells in the eyelid's epidermis. It is the second most common form of eyelid cancer, after basal cell carcinoma. Eyelid SCC...
What is eyelid sebaceous gland carcinoma?
Eyelid sebaceous gland carcinoma (SGC) is a rare and aggressive cancer that originates in the eyelid's sebaceous glands. These glands produce the oily substance that lubricates the eyes. SGC typically presents as a painless,...
What is an Eyelid Laceration?
An eyelid laceration is a cut or tear in the eyelid tissue that can range in severity from a minor superficial injury to a deep, complex wound involving multiple layers of tissue. Accidents, sports injuries,...
What is eyelid edema?
Eyelid edema, also known as eyelid swelling, is a condition in which fluid accumulates in the connective tissues around the eye. This condition can affect one or both eyelids, and its severity ranges from mild puffiness...
What is phacomatoses?
Phacomatoses, also known as neurocutaneous syndromes, are a group of hereditary disorders distinguished by the presence of lesions on both the skin and the nervous system. These conditions are usually genetic, with abnormalities in the development and...
What is the definition of phacoanaphylactic endophthalmitis?
Phacoanaphylactic endophthalmitis, also known as lens-induced uveitis, is an uncommon but severe inflammatory condition of the eye. It occurs as an immune response to lens proteins exposed to the intraocular environment, usually as...
What is Peter's Anomaly?
Peters anomaly is a rare congenital eye disorder that causes abnormalities in the development of the eye's anterior segment. It is named for Dr. Albert Peters, who first described the condition in 1906. This condition primarily...
What is persistent fetal vasculature?
Persistent fetal vasculature (PFV), also known as persistent hyperplastic primary vitreous (PHPV), is a congenital ocular abnormality caused by the failure of the fetal hyaloid vascular system to regress. This system, which includes the hyaloid...
What is Periorbital Cellulitis?
Periorbital cellulitis, also known as preseptal cellulitis, is an infection of the eyelid and surrounding skin that occurs anterior to the orbital septum. It primarily affects the soft tissues surrounding the eye, resulting in swelling, redness,...
What is Eyelid Dermatitis?
Eyelid dermatitis, also known as eyelid eczema, is an inflammatory skin condition that affects the sensitive skin of the eyelids. Symptoms of this condition include redness, swelling, itching, and, in some cases, flaking or crusting of...
What is an Eyelid Burn?
Eyelid burns are a type of ocular injury caused by exposure to thermal, chemical, or electrical agents that harm the delicate skin of the eyelids. These burns can range from minor superficial burns to severe...
What is eyelid basal cell carcinoma?
Eyelid basal cell carcinoma (BCC) is the most common form of eyelid cancer, accounting for roughly 90% of all cases. It develops from basal cells in the epidermis, the skin's outermost layer. BCC is...
What is exotropia?
Exotropia is a type of strabismus (eye misalignment) in which one or both eyes turn outward, away from the nose. This condition can be intermittent or constant, affecting one or both eyes alternately. Exotropia is typically more...
What is exophoria?
Exophoria is a type of heterophoria in which one eye tends to drift outward relative to the other when binocular fusion fails. It is a latent form of strabismus, which means that the eyes appear to be...
What is a Penetrating Eye Injury?
A penetrating eye injury is a severe type of ocular trauma in which an object pierces the cornea or sclera and enters the eye's internal structures. This type of injury can cause significant damage...
What is pediatric glaucoma?
Pediatric glaucoma, also known as congenital glaucoma, is a rare but severe eye condition that affects infants and young children. It is defined by an increase in intraocular pressure (IOP) within the eye, which, if left...
What is papilledema?
Papilledema is a swelling of the optic nerve head or disc caused by high intracranial pressure (ICP). This condition is significant in ophthalmology and neurology because it indicates elevated intracranial pressure, which can have a variety of...
What is Orbital Rhabdomyosarcoma?
Orbital rhabdomyosarcoma is a malignant tumor that develops from skeletal muscle cells in the orbit, the bony cavity that houses the eyeball. It is the most common primary orbital malignancy in children, usually presenting between the...
What is Orbital Pseudotumor?
Orbital pseudotumor, also known as idiopathic orbital inflammation, is a non-specific inflammatory condition of the orbit, the bony cavity that houses the eye. Unlike true tumors, orbital pseudotumors are not cancerous, but they can produce symptoms...
What is Exfoliative Glaucoma?
Exfoliative glaucoma (XFG) is a type of open-angle glaucoma that results from exfoliation syndrome (XFS). XFS causes abnormal flaky material to accumulate in the front of the eye, particularly in the lens and trabecular meshwork. This...
What is esotropia?
Esotropia is a type of strabismus (eye misalignment) in which one or both eyes turn inward towards the nose. This condition can be constant or intermittent, affecting only one eye or alternating between the two. Esotropia can...
What is esophoria?
Esophoria is a type of eye misalignment in which one eye drifts inward towards the nose while both eyes focus on an object. Unlike esotropia, where the misalignment is constant and noticeable, esophoria is a latent condition,...
