Health & Wellness

Contact Prescription Question

  • Last Updated:
  • Apr 5th, 2016 1:10 pm
Deal Addict
Sep 27, 2009
1843 posts
Oakville, ON

Contact Prescription Question

I just got an eye exam at Costco and she said my prescription had changed from -4.25L -4.00R to -4.25L -4.25R. So my right eye prescription got stronger. So I take my prescription over to ther place in Costco where you buy contacts and he said my prescription translates for contacts to -4.00L -4.00R.

I looked at the guy like he had two heads.

Does this make any sense? How does my right guy getting worse, result in my left eye prescription getting weaker?
2 replies
Deal Addict
Aug 1, 2012
1136 posts
Your glasses prescription need to be adjusted for contact lens since there is no distance between lens and your eye with contact lens. This adjustment becomes significant only for sph power higher than 4.
So your glasses prescription of -4.25L -4.25R translates to -4.00L -4.00R for contacts. ... escription
Deal Addict
User avatar
Jun 26, 2011
1689 posts
That's correct. Usually the contact lens prescription will be a bit weaker in power.


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