Different strength ready glasses for people requiring an unbalanced strength for each eye.
Amazon.com: LianSan Reading Glasses with Different Strength - for Each Eye for Women Men TR90 Interchangeable Frame with Adjustable Lens(Tortoise,1.50) : Health & Household
Reading Glasses with Different Strength for Each Eye Tortoise – eyekeeper.com
Amazon.com: LianSan Adjustable Different Power Reading Glasses for Women Men with Spring Hinge TR90 Frame Removable Lens One Eye Readers Tortoise 1.75 : Health & Household
Computer Glasses with Different Power for Each Eye | Reading glasses, Computer glasses, Glasses
Reading Glasses with Different Strength for Each Eye DEMI – eyekeeper.com