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Is a left-eye contact different from a right-eye contact?

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I mail ordered my son's 1st set of contact lenses. When I placed the order, it asked how many boxes I wanted to order for the right eye and how many for the right eye. It had the symbols OD and OS. We received the order and there is nothing on there that says OD or OS. There's a place on the end of the box with an L and a R and a box next to each that looks like it should be checked, but neither is. My son has the same prescription for both eyes, so is the right lens made differently than the right?

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asked May 18, 2017 in Health by Demon

4 Answers

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My son's first set of contacts had the same prescription for both eyes, and he could interchange them. Our eye doctor told him that while it did not matter which eye he put which contact into, he needed to get into the habit of always storing the lenses in the correct L/R compartment in case his prescription changed in the future.
answered May 18, 2017 by Katherine
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I use monthly disposable contact lenses. I'm sure the lenses that I use do not have R or L on the actual lens itself, my prescription for the left eye is slightly stronger than the right eye so when I call to the optician for a supply of lenses, they normally mark on each box R or L. Once I take them from the box to use them, I just make sure every evening to stick to a certain routine of taking say the Right lens out first and putting into the holder for the right lens. If, say, you put your right lens into your left eye, would you not find it blurry if it is not the correct prescription?
answered May 18, 2017 by Greg
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os = oculus sinister
od = oculus dexter

oculus = eye in Latin
sinister = left in Latin
dexter = right in Latin

With rigid gas permeable (RGP) lenses, three things affect whether lenses can be interchanged: correction for each eye, shape of each eye and how well the lenses fit. Over the course of 39 years of wearing contacts, there have been times when the correction and shape were so similar that I couldn't tell if I had reversed the lenses. Other times it was very obvious that I had reversed them because either the correction was "off" or there was physical discomfort because the shape of the eyes was significantly different. I also had one lens that fit so poorly that I kept thinking that I must have reversed the lenses. (I finally had it replaced.)

At each exam and fitting, get your eye doctor to explain in non-medical terms what is going on with the eyes. If s/he can't or won't do this, it's time to find someone else.
answered May 18, 2017 by Jonathan
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I think you should be fine, but honestly I'm not sure. My contacts are two different prescriptions so I assumed OD meant one eye and OS meant the other. Where did you end up getting them from?
answered May 18, 2017 by Jonny Cake

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