<unk> , also known as asthenopia (from Greek a-sthen-opia, , ), is an<unk>  condition that manifests through non-specific symptoms such as fatigue, pain in or around the<unk> s, blurred vision, headache, and occasional double vision. Symptoms often occur after long-term use of computers, digital devices, reading or other activities that involve extended visual tasks which are broadly classified into external and internal symptom factors. When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the ciliary muscles and the extraocular muscles are<unk> ed. This causes discomfort, soreness or pain on the<unk> balls. Closing the<unk> s for ten minutes and relaxing the muscles of the face and neck at least once an hour usually relieves the problem. A page or photograph with the same image twice, but slightly displaced (from a printing mishap, a camera moving during the shot, etc.) can cause<unk>  due to the brain misinterpreting the image fault as diplopia and trying in vain to adjust the sideways movements of the two<unk> balls to fuse the two images into one.<unk>  can also happen when viewing a blurred image (including images deliberately partly blurred for censorship), due to the ciliary muscle tightening trying in vain to focus the blurring out.
Eye strain
Leper colony
Tocolytic
PLOS Pathogens
Pest house
Leech
Sultiame
Long COVID