Difference between revisions of Frequently Asked Questions/Glasses

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===Should I use glasses or contact lenses for close-up?===

You can wear [[contact lenses]] with [[plus lenses]] to achieve the same effect as a pair of [[differentials]]. It's generally preferable to wear glasses in general, but people have managed to improve their eyesight with contact lenses.

{{jake says|(In particular for high myopes, these considerations.)

The tradeoff with glasses over contact lenses (for close-up use) is:

1) Cost (you’re going through a lot of lenses coming down from high myopia, and some people prefer higher index which is also more expensive).

2) Field of vision and image quality. Less of an issue for close-up, but you are going to get less visual quality from a high diopter lens than a high diopter contact lens (in most cases, though you can get somewhat closer with some very high quality, high index lenses).

3) Convenience. You can easily get some replacement contact lenses, experiment with them for reduced diopters. You can easily put a plus lens over contacts for immediate close-up and not carrying two pairs of glasses.

All in all though, I often suggest going with glasses. High diopter contact lenses are thicker, less gas permeable, and tend to cause more corneal abrasion. They disrupt tear fluid. While it always depends on the individual, it’s important to be aware of and consider all of these factors. }}

==How do I calculate math related to optics?==

See [[optics related math]] for more information.

@@ Line 54: / Line 54: @@
 ===Should I use glasses or contact lenses for close-up?===
 You can wear [[contact lenses]] with [[plus lenses]] to achieve the same effect as a pair of [[differentials]]. It's generally preferable to wear glasses in general, but people have managed to improve their eyesight with contact lenses.
+{{jake says|(In particular for high myopes, these considerations.)
+The tradeoff with glasses over contact lenses (for close-up use) is:
+) Cost (you’re going through a lot of lenses coming down from high myopia, and some people prefer higher index which is also more expensive).
+) Field of vision and image quality. Less of an issue for close-up, but you are going to get less visual quality from a high diopter lens than a high diopter contact lens (in most cases, though you can get somewhat closer with some very high quality, high index lenses).
+) Convenience. You can easily get some replacement contact lenses, experiment with them for reduced diopters. You can easily put a plus lens over contacts for immediate close-up and not carrying two pairs of glasses.
+All in all though, I often suggest going with glasses. High diopter contact lenses are thicker, less gas permeable, and tend to cause more corneal abrasion. They disrupt tear fluid. While it always depends on the individual, it’s important to be aware of and consider all of these factors. }}
 ==How do I calculate math related to optics?==
 See [[optics related math]] for more information.