Difference between revisions of Close-up glasses
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when are differentials worn
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==First Differentials== | ==First Differentials== | ||
The first differentials are typically 1.5 D weaker than your [[measurement]] for full distance vision. If you have -0.25 D of cylinder, you have the option of dropping that. If you have -0.5 to -0.75 D of cylinder, you have the option of dropping that and having the sphere only 1.25 D weaker. | The first differentials are typically 1.25 - 1.5 D weaker than your [[measurement]] for full distance vision. If you have -0.25 D of cylinder, you have the option of dropping that. If you have -0.5 to -0.75 D of cylinder, you have the option of dropping that and having the sphere only 1 - 1.25 D weaker. | ||
See [[Lens#How to use Contacts with EM|How to use Contacts with EM]] if you wear contacts. | See [[Lens#How to use Contacts with EM|How to use Contacts with EM]] if you wear contacts. | ||
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== Habits == | == Habits == | ||
It is useful to apply the [[3 hour rule]] or the [[20-20-20 rule]] when engaging in close up (near) work. | It is useful to apply the [[3 hour rule]] <!--or the [[20-20-20 rule]]--> when engaging in close up (near) work. | ||
Always be mindful to be in a good ergonomic position. Leaning in is a common issue and is something you need to be mindful to avoid. | Always be mindful to be in a good ergonomic position. Leaning in is a common issue and is something you need to be mindful to avoid. | ||
Good ambient lighting is important because your eyes can not see as far or as well in low lighting. Natural light is best but supplement as needed. | Good ambient lighting is important because your eyes can not see as far or as well in low lighting. Natural light is best but supplement as needed. | ||
== When are differentials worn? == | |||
Wear your differential glasses any time you are doing close work. If you have to get up to go to the bathroom, switch back to your normalized glasses. You get used to it pretty fast. | |||
'''What is "close" work?''' Norms minus diffs = the number of diopters you need to convert to find this answer. For example, if your normalized glasses are -5 and your differential glasses are -3.5, then you need to convert -1.5. You should be able to see 66.67cm with -1.50 myopia! That's about 26.24 inches, or a little more than 2 feet. | |||
Read a book with differentials. Use your computer with differentials. | |||
== See also == | == See also == | ||