#refractive errors
- Asthenopia — An ophthalmological condition manifested by rapid visual fatigue, accompanied by headaches, tearing, blurred vision, and a burning sensation in the eyes; it usually occurs following prolonged visual effort (reading, computer work) or due to improperly corrected refractive errors (hyperopia, astigmatism).
- Astigmatic — The feminine form of the word 'astigmat'; a woman or female person suffering from astigmatism; as an adjective, it refers to a manifestation, an ocular anatomical structure, a lens, or an image affected by this refractive error or designed to treat it.
- Astigmometer — An optical precision apparatus or instrument used in ophthalmology and optometry to measure the degree and axes of ocular astigmatism, evaluating the curvature irregularities of the anterior surface of the cornea.