How to Tell If a Lens Is Inside Out or Not?
How to Tell If a Lens Is Inside Out or Not?
This is probably one of the most common problems faced by friends who are new to using lenses; they can waste a lot of time trying to figure out whether the lens is the right way or inside out, and sometimes end up wearing the lens inside out, going out, and spending the whole day with discomfort in their eyes. Let’s look at how you can tell if a lens is inside out or not.
Firstly, if you put the lens on inside out, it will poke your eye every time you blink, warning you that you have put it on the wrong way.
Secondly, when lenses are inside out, the top side is pointed and the sides are curved outward.
As you can see in the picture above, a correctly oriented lens sits in an oval shape, while an inside out lens has a sharper outline.
How to Tell Right Side and Inside Out in Brands Like Acuvue Oasys
For the Acuvue Oasys lens I use, they have thought of an easier way to tell, and have written "123" on the lens. This marking is found right on the edge of the lens and it never bothers you.
If you look at the lens and read it as "123", your lens is the right way; if you read it as "321", your lens is inside out, so you can very easily figure out whether your lens is inside out or not.
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