If your pupils stay small even in dim light, it can be a sign that things in your eye aren't working the way they should. This is called abnormal miosis, and it can happen in one or both of your eyes.

Physiological Causes (Normal Response) The pupils are the gateway to the light-sensitive retina at the back of the eye. Normally, pupils are 2 to 8 mm in size.

In bright light, they get smaller or constrict to let in less light. Sometimes, pupils can dilate without any change in light. ... How to protect your eyes when the pupils are dilated.

New research suggests your pupils may reflect how clearly you remember something. Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent every weekday.

The pupils of our eyes get larger when we are focusing on a task–and the size may give clues about our working memory capabilities, a new study has found. A person's pupils dilate in low-light ...

People whose eyes dilated more performed better on tests of working memory. ... (indicated by less variation in pupil size) than people who performed worse, Garner says.

Eye color, shape, and size; Pupil shape — predatory animals have vertically elongated pupils, while prey animals’ pupils tend to be horizontal. For instance, at night, black bears have large, round, ...

Banks and his team looked at the eyes of 214 different species of land animals, and found a clear relationship between the shape of their pupils and their ecological role. Predatory animals that ...

The medical term for pupils of different sizes is anisocoria. Find out about the possible causes of anisocoria here, as well as when to seek emergency treatment.

Eye-opener: Pupils enlarge when people focus on tasks. ScienceDaily . Retrieved June 2, 2025 from www.sciencedaily.com / releases / 2024 / 04 / 240422170805.htm ...

The colors we see may get increasingly dull as we get older, scientists have found. The pupils of younger people's eyes react differently to bright colors than those of older folk, a new paper in ...

Eye color, shape, and size; Pupil shape — predatory animals have vertically elongated pupils, ... often yellow-to-orange (but sometimes red or green), nearly pupil-less eyes, set close to the ...