Retin: From 1 Different Sources
(retino-) combining form denoting the retina. Example: retinopexy (fixation of a detached retina).
Inflammation of the retina... retinitis
A rare malignant growth of the retina (see EYE) which occurs in infants. It can sometimes be discovered at birth because shining a light in the baby’s pupil produces a white re?ection rather than a red one. Alternatively, the infant may present with a SQUINT or a mass in the abdomen. In 25 per cent of cases there is a family history of the condition and abnormality of chromosome 13 is common (see CHROMOSOMES). It is treated by removing the eye or, if affecting both eyes, by laser PHOTOCOAGULATION with or without RADIOTHERAPY.... retinoblastoma
See EYE, DISORDERS OF – Retina, disorders of.... retinopathy
Separation of the retina from the choroid in the EYE. It may be due to trauma or be secondary to tumour or in?ammation of the choroid, and causes blindness in the affected part of the retina. It can be treated surgically using PHOTOCOAGULATION.... detached retina
Any one of a collection of drugs that are derived from vitamin A (see APPENDIX 5: VITAMINS). They can be taken orally or applied topically, and affect the skin by causing drying and peeling, with a reduction in the production of SEBUM. These properties are useful in the treatment of ACNE and PSORIASIS.... retinoids
Blockage of an artery supplying blood to the retina, most commonly due to thrombosis or embolism, The disorder can result in permanent blindness or loss of part of the field of vision, depending on the artery affected and whether or not the condition can be treated quickly enough.... retinal artery occlusion
See EYE, DISORDERS OF.... retina, disorders of
See: BLEEDING. ... eyes - retinal haemorrhage
A type of vision test in which a beam of light is shone from an instrument called a retinoscope into each eye in turn. The effect of different lenses on the beam of light determines whether glasses are needed for various refractive errors, such as hypermetropia, myopia, or astigmatism. Retinoscopy is particularly useful for assessing babies or young children.... retinoscopy
(ARN) severe inflammation and necrosis of the retina associated with inflammation and blockage of retinal blood vessels, haemorrhage and death of retinal tissue, and retinal detachment. It may affect both eyes (bilateral acute retinal necrosis, BARN), and visual prognosis is poor. ARN is thought to be due to viral infection.... acute retinal necrosis
swelling of the retina, usually resulting from blunt trauma to the eye. The swelling usually resolves over a few days.... commotio retinae
see retinopathy.... diabetic retinopathy
damage to the retina associated with severe head injuries. It can also occur with other types of trauma, such as long-bone fractures, and with several nontraumatic systemic diseases. [O. Purtscher (1852–1927), Austrian ophthalmologist]... purtscher’s retinopathy
n. (pl. retinacula) a thickened band of tissue that serves to hold various tissues in place. For example, flexor retinacula are found over the flexor tendons in the wrist and ankle.... retinaculum
1. (retinene) n. the aldehyde of retinol (*vitamin A). See also rhodopsin. 2. adj. see retina.... retinal
separation of the retina from its insertion at the ora serrata (the anterior margin of the retina, lying just posterior to the ciliary body). This acts as a retinal tear and causes a *retinal detachment.... retinal dialysis
n. see retinal.... retinene
n. any one of a group of drugs derived from vitamin A. They bind to one or more of six specific receptors that are found on many cells. On the skin they act to cause drying and peeling and a reduction in oil (sebum) production. These effects can be useful in the treatment of severe *acne, *psoriasis, *ichthyosis, and other skin disorders. Retinoids include *isotretinoin, *tretinoin, acitretin, tazarotene, and alitretinoin, which is particularly effective for hyperkeratotic hand eczema. Possible side-effects, which may be serious, include severe fetal abnormalities (if taken by pregnant women), toxic effects on babies (if taken by breastfeeding mothers), liver and kidney damage, excessive drying, redness and itching of the skin, and muscle pain and stiffness.... retinoid
n. any surgical procedure used to repair a *retinal detachment. See pneumoretinopexy; cryoretinopexy.... retinopexy
n. splitting of the layers of the neurosensory retina with accumulation of fluid between the layers. This is usually static or it may progress very slowly compared to other types of *retinal detachment.... retinoschisis
n. an instrument used to determine the power of spectacle lens required to correct *refractive errors of the eye. It is held in the hand and casts a beam of light into the subject’s eye. The examiner looks along the beam and sees the reflection in the subject’s pupil. By interpreting the way the reflection moves as the instrument is moved, and by altering this by lenses held in the other hand near the subject’s eye, the examiner is able to determine the degree of refractive error. —retinoscopy n.... retinoscope
n. a surgical incision into the retina.... retinotomy
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