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Meaning of cylinder on a prescription

Question

What does cylinder mean on my prescription?

Answer Video and written answer:
Qualified optometrist Dr Nigel Best DOptom MCOptom FBCLA FAAO answers this question:

If you are astigmatic, your prescription will include a figure for the amount of cylindrical power which your lenses require. The number describes the difference in dioptres between your cornea's steepest and shallowest curves.

For more information about your prescription, see our video below:

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Optician's Biography

Dr Nigel Best DOptom MCOptom FBCLA FAAO has worked as an optometrist for Specsavers for 17 years, both in his own practice and with the Professional Training department. He has a particular interest in dry eye and contact lenses and has had a number of academic papers published.
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