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Myopia; Other names: near-sightedness, short-sightedness: Diagram showing changes in the eye with myopia: Specialty: Ophthalmology, optometry: Symptoms: Distant objects appear blurry, close objects appear normal, headaches, eye strain [1]
Micropsia is a condition affecting human visual perception in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema, macular degeneration, or central serous ...
The ganglion cells give information about ambient light levels, and react sluggishly compared to the rods and cones. Signals from photosensitive ganglion cells have multiple functions including acute suppression of the hormone melatonin, entrainment of the body's circadian rhythms and regulation of the size of the pupil.
Woman with a headache right behind her eye. Neurologists call headaches behind the eyes "retro-orbital headaches," which means "behind the eyeball socket." The rest of us call them "hell."
[2] [3] Patients may have up to 3 diopters of anisometropia before the condition becomes clinically significant due to headache, eye strain, double vision or photophobia. [ 4 ] In certain types of anisometropia, the visual cortex of the brain cannot process images from both eyes simultaneously ( binocular summation ), but will instead suppress ...
A migraine headache can throw your whole day off track. But if you can learn to pick up on your subtle migraine warning signs, you might able to avoid the pain entirely, experts say. "This is a ...
Aniseikonia is an ocular condition where there is a significant difference in the perceived size of images. It can occur as an overall difference between the two eyes, or as a difference in a particular meridian. [1] If the ocular image size in both eyes are equal, the condition is known as iseikonia. [2]
Cluster headache is a neurological disorder characterized by recurrent severe headaches on one side of the head, typically around the eye(s). [1] There is often accompanying eye watering, nasal congestion, or swelling around the eye on the affected side. [1]