Day blind

Introduction Blindness refers to an anomaly in which the vision is worse than when the light is dim in a brightly lit environment. Often contribute to the localization diagnosis of neuropathy. When the optic chiasm is oppressed by the tumor, it often causes typical bilateral hemianopia. Some ophthalmic diseases can also cause hemianopia-type visual field defects, such as nasal visual field defects in advanced glaucoma, blunt-type visual field defects in retinal vascular occlusion, and visual field defects in the opposite direction when the retina is partially detached. It should be distinguished from diseases such as night blindness and hemianopia. a bit.

Cause

(1) Any lesion on the conduction path of the fovea of the macula or the pyramidal cell in the fovea may cause paralysis, such as congenital total color blindness, macular degeneration, optic atrophy after axial optic neuritis, etc. .

(2) Some eye diseases in which the central part of the cornea or lens is turbid and the peripheral part is still transparent, such as nuclear cataract, congenital nucleus cataract or anterior and posterior cataract, and small white spots in the central cornea.

(3) When the pathological pupil is dilated, the vision is poor due to photophobia under strong light.

an examination

Related inspection

Ultrasound examination of the eyeball and eyelids Eye examination and CT examination of the temporal region

A diagnosis can be made based on medical history and eye examination. Ultrasound examination of the eyeball and eyelids was performed by CT in the eye and temporal region.

Differential diagnosis

"Chicken blind" or "bird blind": Eyes that are unclear at night or in the dark, white spots or light as usual, and eye appearance is the main manifestation of eye disease. Commonly known as chicken blind, night blind.

Partial hemianism: Medical terminology refers to the partial diagnosis of a part of the visual field. The hemianopia caused by visual pathological lesions often contributes to the localization diagnosis of neuropathy. When the optic chiasm is oppressed by the tumor, it often causes typical bilateral hemianopia. Some ophthalmic diseases can also cause hemianopia-type visual field defects, such as nasal visual field defects in advanced glaucoma, blunt-type visual field defects in retinal vascular occlusion, and visual field defects in the opposite direction when the retina is partially detached.

Cortical blindness: A central visual dysfunction caused by toxins or vasospasm in the occipital cortex of the brain, with vasospasm being the most common. The clinical manifestations are complete loss of binocular vision, normal pupillary light reflex, normal fundus, and hemiplegia.

Night blindness: The severe manifestation of decreased sensitivity to weak light and prolonged dark adaptation time. The main symptom is that the daytime vision is almost normal, and when the light is dim at dusk, the vision is unclear.

The material in this site is intended to be of general informational use and is not intended to constitute medical advice, probable diagnosis, or recommended treatments.