Loss of peripheral vision

Loss of the upper and outer parts of the visual field may be due to drooping of the eyelids (ptosis) or upper eyelid skin (dermatochalasis)

Where the onset is rapid in one eye only it often indicates a blocked vein (retinal vein occlusion) or artery (retinal artery occlusion), bleeding inside the eye (vitreous haemorrhage), or, especially with flashing lights or floaters, retinal detachment.

Progressive patchy loss of peripheral vision is seen in glaucoma.

Rare causes include:

Pituitary and brain disorders eg stroke

Specific retinal defects such as tumours and haemorrhage

Optic disc abnormalities such as tilting and drusen