| simple hyperopic astigmatism | That form of astigmatism in which one meridian is hyperopic and the one at right angle to it is without a refractive error. Synonym: simple hyperopic astigmatism. (05 Mar 2000) |
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| irregular astigmatism | Astigmatism in which different parts of the same meridian have different degrees of curvature. (05 Mar 2000) |
| lenticular astigmatism | Astigmatism due to defect in the curvature, position, or index of refraction of the lens. (05 Mar 2000) |