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How contacts are used in EM
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=== Contacts === | === Contacts === | ||
Contact lenses are in physical contact with your eye, and have a vertex distance of 0. They carry high risks of infection, [[dry eye]] and other eye injuries, and require extensive care, and are hard to swap out multiple times a day, but have fewer distortion effects than glasses at higher powers. | Contact lenses are in physical contact with your eye, and have a vertex distance of 0. They carry high risks of infection, [[dry eye]] and other eye injuries, and require extensive care, and are hard to swap out multiple times a day, but have fewer distortion effects than glasses at higher powers. Typically when contacts are used in the EM method, they are supplemented with tuning glasses over to get the multiple focal planes needed. For example you might wear contacts that are selected to be [[differentials]] and wear [[minus lenses]] over for [[normalized]] or you might wear full prescription contacts, with two powers of [[plus lenses]] over to reach normalized and differential powers. This ruins the cosmetic benefits of wearing contacts, but may make the process easier for people with strong lenses or who need to not wear glasses for sports or other reasons. | ||
==See Also== | ==See Also== | ||