Difference between revisions of Lens

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=== 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. ~~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.

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.

====How to use Contacts with EM====

Choose a power for your contacts to match, your prescription, [[normalized]], or [[differentials]], and then use glasses over the contacts to get to the other focal planes you need. 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.

* Since it's easiest to get contacts at full prescription, and many people want contacts for outdoor activity, most people use prescription contacts and [[plus lenses]] over. This may put you in the range to use cheap drug store readers, but it's better to get good ones from a custom [[lens seller]].

* The next most common strategy is to use differential contacts with [[minus lenses]] over for [[normalized]]. This has the advantage of less total lens over the eye, and a thinner contact may be more comfortable and allow more oxygen through to the surface of the eye. (And in specific cases may affect the cost of contact lenses, when stepping down from the extended range brand to the normal range brand in the same material/design.) This has the disadvantage of requiring glasses for outdoor activity.

==See Also==

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 === 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.  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.
+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.
+====How to use Contacts with EM====
+Choose a power for your contacts to match, your prescription, [[normalized]], or [[differentials]], and then use glasses over the contacts to get to the other focal planes you need.  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.
+* Since it's easiest to get contacts at full prescription, and many people want contacts for outdoor activity, most people use prescription contacts and [[plus lenses]] over.  This may put you in the range to use cheap drug store readers, but it's better to get good ones from a custom [[lens seller]].
+* The next most common strategy is to use differential contacts with [[minus lenses]] over for [[normalized]].  This has the advantage of less total lens over the eye, and a thinner contact may be more comfortable and allow more oxygen through to the surface of the eye.  (And in specific cases may affect the cost of contact lenses, when stepping down from the extended range brand to the normal range brand in the same material/design.)  This has the disadvantage of requiring glasses for outdoor activity.
 ==See Also==

Difference between revisions of Lens

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