photopsia


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photopsia

 [fo-top´se-ah]
an appearance as of sparks or flashes, in retinal irritation.

pho·top·si·a

(fō-top'sē-ă),
A subjective sensation of lights, sparks, or colors due to electrical or mechanical stimulation of the ocular system.
See also: Moore lightning streaks.
Synonym(s): photopsy
[photo- + G. opsis, vision]

photopsia

/pho·top·sia/ (fo-top´se-ah) appearance as of sparks or flashes in retinal irritation.

pho·top·si·a

(fō-top'sē-ă)
A subjective sensation of lights, sparks, or colors due to electrical or mechanical stimulation of the ocular system.
Synonym(s): photopsy.
[photo- + G. opsis, vision]

photopsia

Visual sensations of light originating in the eyes or the nervous system and due to stimulation of the retinas or visual nerve pathways other than by light. Mechanical stimuli from traction on the retina by the VITREOUS BODY can cause photopsia. They are examples of entoptic phenomena. Also known as phosphenes.

photopsia 

Hallucinatory perceptions such as sparks, lights or colours arising in the absence of light stimuli and observed when the eyes are closed. They occur often as a result of diseases of the optic nerve, retina (e.g. retinal and vitreous detachment) or the brain, migraine, or they can also occur with pressure upon the closed eye. See floaters; flashes; cytomegalovirus retinitis; Fuchs' spot.
References in periodicals archive ?
11 Associated Visual Pathologies Incipient Cataracts 2 -- Photopsia 2 1 Mild Central Macular 1 -- Edema Mild Macular 1 -- Degeneration LE = left eye, logMAR = logarithm of minimum angle of resolution, RE = right eye, VA = visual acuity, VF = visual field.
Safety of ivabradine: During the follow up period, one patient ran into decompensation and [beta]-blockers were stopped and resumed after 10 days, another patient developed photopsia when the dose of ivabradine reached 15 mg/day.
Photopsia and similar phenomena are not uncommon with 5HT antagonist antidepressants, such as nefazodone.
Practitioners should be aware of the ocular symptoms associated with PIH; these include blurring/loss of vision, diplopia, scotomas and photopsia.
Therefore, it is imperative that patients exhibiting any symptoms suggestive of posterior segment pathology, such as photopsia, metamorphopsia or vision loss, undergo a dilated fundus examination.
Stephens and Shields reviewed 70 cases of choroidal metastasis and found that blurred vision was the presenting complaint in 80% of patients, and pain in 14%, photopsia in 13%, red eye and floaters in 7% and field defects in 3%.
Photopsia is a perception of flashing lights, and its etiology varies; causes can be categorized as emergent or nonemergent.
Causes of Photopsia Environmental Reflections off corrective lenses or windows, lightning flashes and other environmental light sources can, on occasion, be mistaken for a visual phenomenon.
Ocular findings include blurred vision, scotomas, photopsia, diplopia and retrobulbar pain.
24) A patient may experience symptoms of photopsia, floaters, a dark curtain in the visual field, or a loss of visual acuity.