Difference between revisions of Close-up glasses
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'''Differentials''' are reduced strength glasses for [[close-up|close up activity]]. They have a lower correction than your [[normalized]] lenses that allows you to see clearly only up to the screen. The difference between [[normalized]] and differential lenses is usually between 1 and 2 [[diopters]].<ref>{{cite jake|https://endmyopia.org/faq-items/what-is-the-differential-prescription/|What is the differential prescription?}}</ref><ref name=ChooseReduction>{{cite jake|https://endmyopia.org/choose-reduced-glasses-prescription-differential-close-friendly-glasses/|How To Choose A Reduced Glasses Prescription (Differential / Close-Up Friendly Glasses)}}</ref> | '''Differentials''' are reduced strength glasses for [[close-up|close up activity]]. They have a lower correction than your [[normalized]] lenses that allows you to see clearly only up to the screen. The difference between [[normalized]] and differential lenses is usually between 1 and 2 [[diopters]].<ref>{{cite jake|https://endmyopia.org/faq-items/what-is-the-differential-prescription/|What is the differential prescription?}}</ref><ref name=ChooseReduction>{{cite jake|https://endmyopia.org/choose-reduced-glasses-prescription-differential-close-friendly-glasses/|How To Choose A Reduced Glasses Prescription (Differential / Close-Up Friendly Glasses)}}</ref> | ||
==Low Myopia== | |||
People with myopia of -2 D and lower do not typically need to wear differentials (because with -2 D your distance till blur should be around 50cm - far enough to see your screen with sufficient clarity). | People with myopia of -2 D and lower do not typically need to wear differentials (because with -2 D your distance till blur should be around 50cm - far enough to see your screen with sufficient clarity). | ||
If you | ==First Differentials== | ||
The first differentials are typically 1.5D weaker than your [[Measurement]] for full distance vision. If you have -0.25 to -0.75D of cylinder, you have the option of dropping that and having the sphere only 1.25D weaker. | |||
See [[Lens#How to use Contacts with EM|How to use Contacts with EM]] if you wear contacts. | |||
==Why are differentials worn?== | ==Why are differentials worn?== | ||
The primary stimulus for [[axial elongation]] of the eyeball is [[hyperopic defocus]], which occurs when someone: | The primary stimulus for [[axial elongation]] of the eyeball is [[hyperopic defocus]], which occurs when someone: | ||
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== See also == | == See also == | ||
[[Guide:Reducing differentials]] | * [[Guide:Reducing differentials]] | ||
* [[Lens-induced myopia]] | |||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
[[Category:Articles]] | [[Category:Articles]] | ||