Ophthalmology Terminology D
Dacryocystitis. It is infection of the lacrimal sac which is a part of the drainage system of tears.
Dacryocystorhinostomy. It is a surgery to restore the communication between lacrimal sac to the nose through creating an opening and overcome obstruction in the nasolacrimal duct.
Dark Adaptation. It is physical and chemical adjustment of the human eye to a dark environment.
Diabetic Retinopathy. Retinal changes that occur in patients with Diabetes Mellitus.
Diffuse Lamellar Keratitis. It is one of the complications that occur after Lasik Eye Surgery.
Diplopia. Double vision or perception of two images instead of one. It can be uniocular diplopia which is double vision with one eye open or binocular diplopia which is double vision with two eyes open.
Dissociated Vertical Deviation. Type of vertical strabismus in children and it involves multiple extraocular muscles.
Dolls Eye Reflex. Ocular reflex that occurs during head movement in order to stabilize images on the retina. Ocular movement occurs in the opposite direction of the head movement. It is called vestibulo-ocular reflex because it occurs with the help of the vestibular system of the inner ear. It is helpful to assess visual acuity in infant.
Drusens. It is lipid like materials that deposit between the retina and choroid in a membrane called bruchs membrane. It can be the first sign but not specific for age related macular degeneration.
Dry Eyes. Deficiency in the tear film of the eye. Read more about the causes, signs and symptoms and how to treat it.
Dry Macular Degeneration. It is type of Age Related Macular Degeneration. It is Characterized by drusens and degeneration of Retinal Pigment Epithelial layer of the retina without the formation of abnormal choroidal blood vessels.
Duane Syndrome. One of the causes of strabismus in children due to abnormalities in the innervation of the lateral rectus muscle.