(uncountable) The quality of being adapted; adaption; adjustment.
(uncountable) Adjustment to extant conditions: as, adjustment of a sense organ to the intensity or quality of stimulation; modification of some thing or its parts that makes it more fit for existence under the conditions of its current environment
(countable)Something which has been adapted; variation.
dimness or blurring of the eyesight due to a fault in transmission of signals to the brain
A faint whitish ring around the iris in elderly people; discoloration of the iris with age.
An ophthalmological condition that manifests itself through nonspecific symptoms such as fatigue, red eyes, eye strain, pain in or around the eyes, blurred vision, headache and occasional double vision.
suffering from astigmatism
(optics) A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.
(pathology) A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image.