What is irregular astigmatism –
Correct Answer: Non perpendicular principal meridians
Description: It is characterized by an irregular change of refractive power in different meridia. There are multiple meridia which admit no geometrical analysis.the principal meridians are not perpendicular to each other Image : Corneal topographies in regular and irregular astigmatisms. A: Regular astigmatism of 4.0 diopters with two perpendicular main meridians. B: Irregular astigmatism of 6.5 diopters with non-perpendicular main meridians. Reference : A K KHURANA OPHTALMOLOGY,Edition 4,Page-38
Category:
Ophthalmology
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