The Ability Of The Lens To Accommodate . Few People Have A Pair Of Eyes That Show Exactly Equal Refractive Characteristics; One Eye May Need A "Stronger" Lens Than The Other.
Glasses Are Worn For Eye Protection In Some Sports, Such As Squash.Glasses Wearers May Use A Strap To Prevent The Glasses From Falling Off.
Not Only Do They Enhance The Wearer's Visual Experience, But Can Also Reduce Problems That Result From Eye Strain, Such As Headaches Or Squinting.
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