Astigmatism | 合法醫療器材資訊網

Causes—Althoughastigmatismmaybeasymptomatic,higherdegreesofastigmatismmaycausesymptomssuchasblurredvision,doublevision,squinting,eye ...

Type of eye defect

Medical condition

Astigmatism is a type of refractive error due to rotational asymmetry in the eyes refractive power. This results in distorted or blurred vision at any distance.[1] Other symptoms can include eyestrain, headaches, and trouble driving at night.[1] Astigmatism often occurs at birth and can change or develop later in life.[5] If it occurs in early life and is left untreated, it can result in amblyopia.[2]

The cause of astigmatism is unclear; however, it is believed to be partly related to genetic factors.[3][4] The underlying mechanism involves an irregular curvature of the cornea or abnormalities in the lens of the eye.[1][3] Diagnosis is by an eye examination, through objective and subjective refraction.[1]

Three treatment options are available: glasses, contact lenses, and surgery.[1] Glasses are the simplest.[1] C...