Normally, you can see them on the top of your prescription form. ‘SPH’ (sphere or spherical) meaning the degree of nearsightedness or farsightedness, and it indicates the value of lens power you need to see clearly. ‘CYL’ (cylinder or cylindrical) measures the degree of astigmatism, ...
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For instance, the Sydney Myopia Study18 on 468 children and their parents who were using spectacle prescriptions found no significant difference in mean cylinder values between children with parents with astigmatism and those with parents with astigmatism. Astigmatism has been observed to be more ...