astigmia

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Noun	1.	astigmia - (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people astigmatism ophthalmology - the branch of medicine concerned with the eye and its diseases ametropia - (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia keratectasia - abnormal bulging of the cornea of the eye keratoconus - abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia
	2.	astigmia - (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point astigmatism optics - the branch of physics that studies the physical properties of light condition, status - a state at a particular time; "a condition (or state) of disrepair"; "the current status of the arms negotiations"

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Again, there is a limit as to how long a person with moderate to large amounts of astigmia can concentrate on a detailed task without some avoidance and/or fatigue that can lead to an eye-tension-related headache.