Ask the Optician

If I had a toric contact lens with a smaller diameter would it make it slip?


I wear toric contacts lenses & my diameter on them is 14.50 if I had a contact of diameter of 14.00. Could this cause my contact to slip about 90 degrees out of vision?

Answer Written answer:

It would fit differently, because the diameter of a lens is related to the back curve, and if you alter one parameter it alters the other. A small diameter can make the lens flatter and therefore it can become less stable.  On the other hand it may fit just as well!  Your contact lens practitioner is there to fit you with the best possible lens, and if you want to change the lens you are wearing for another make, you need to be refitted to ensure that the lens is physically and physiologically suitable for your eyes.

We recommend you seek professional advice if you are concerned about your eye health:

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Optician's Biography

Simon Kay BSc(Hons) MCOptom has been a qualified Optometrist for over 35 years, and has a vast experience of almost all aspects of optometry. He joined Specsavers Opticians in 1993 first in Liverpool and for 15 years as a director of Lancaster and Morecambe. He served on many panels and committees whilst a director, including those responsible for IT design and professional advancement. He was regional chairman of the North West directors of Specsavers for over 12 years and as such was involved in almost all aspects of optometry on a business and professional level. He has been involved on the Local Optical Committee for many years and is currently Vice Chairman in his area.
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