| multifocal |
Progressive lenses, also called progressive addition lenses, progressive power lenses, and varifocal lenses, are glasses used to correct presbyopia when a person has some other refraction error such as myopia or astigmatism. A gradient of increasing lens power is added to the correction for the other refraction error, going from nothing at the top of the lens to maximum magnification at the bottom of the lens. ...
출처: en.wikipedia.org/wiki/Multifocal
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| multifocal |
1 : having more than one focal length 2 : arising from or occurring in more than one focus or location
출처: virtualtrials.com/dictionary.cfm
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| multifocal |
A lens which is characterized to two or more foci or gradient foci, eg progressive lens.
출처: www12.mawebcenters.com/coltslaboratories/gloss.ivn...
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| multifocal |
Cancer that is in multiple sites within one quadrant of the breast.
출처: oes.mans.eun.eg/Courses/med/surgery/graphics/cf_st...
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| multifocal |
literally means "having more than one focus," so bifocal and trifocal lenses are actually types of multifocal lenses. In addition to bifocal and trifocal lenses, the other multifocal is a progressive addition (no-line bifocal) lens that increases in power from top to bottom. Progressive lenses have no clear dividing lines as the focus changes from bottom to top. They have become popular in recent years because they look like single vision glasses.
출처: www.visionrx.com/library/enc/enc_prescglasses.asp
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