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Large change in astigmatism

Question

Old Prescription (06/08/12)

Sph Cyl Axis Sph Cyl Axis
Right +2.00 -0.25 80.0 Left +1.50 -0.75 100.0
Near +2.00 Add +2.00 Add

New Prescription (31/05/2013)

Sph Cyl Axis Sph Cyl Axis
Right +2.75 -0.75 75.0 Left +2.00 -0.75 100.0
Near +4.50 -0.75 75.0 Left +3.75 -0.75 100.0

My old and new prescriptions, taken 10 months apart shows that my astimatism for my right eye has jumped from -0.25 to -0.75. Looking back at my old records going back about 10 years, my astimatism for both eyes showed no difference. It is only this new prescription (31/05/2013) that shows that there is a big jump in my astimatism for the right eye.
This is the first time that Specsavers has done my eye test. Do you think that an error was made?

Answer Written answer:
Qualified optometrist Simon Kay BSc(Hons) MCOptom answers this question.

This is an acceptable change and in fact quite small and normal for your astigmatism to alter in this time period. Astigmatism reflects the shape of your eye and it needs only a very small change in the shape to cause an increase or decrease in the amount of astigmatism. 

Optician's Biography

Simon Kay BSc(Hons) MCOptom has been a qualified Optometrist for over 30 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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