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2. Multifocal intraocular lens - Wikipedia

   en.wikipedia.org/wiki/Multifocal_intraocular_lens

   Multifocal IOLs: achieve near and distance vision by having two (bifocal) or three (trifocal) focal points simultaneously. The function of multifocal IOL depends on the pupil size for refractive types. The concept is based on the principle that the pupil tends to constrict for near tasks, so the central portion of the lens is designed for near ...

3. List of soft contact lens materials - Wikipedia

   en.wikipedia.org/wiki/List_of_soft_contact_lens...

   The US Food and Drug Administration (FDA) defines soft contact lenses as: made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your ...

4. Intraocular lens - Wikipedia

   en.wikipedia.org/wiki/Intraocular_lens

   Intraocular lens. An Intraocular lens ( IOL) is a lens implanted in the eye usually as part of a treatment for cataracts or for correcting other vision problems such as short sightedness and long sightedness; a form of refractive surgery. If the natural lens is left in the eye, the IOL is known as phakic, otherwise it is a pseudophakic lens (or ...

5. Clear lens extraction - Wikipedia

   en.wikipedia.org/wiki/Clear_lens_extraction

   Clear lens extraction (CLE), also known as refractive lensectomy, custom lens replacement (CLR) or refractive lens exchange (RLE) is a surgical procedure in which clear lens of the human eye is removed. Unlike cataract surgery, where cloudy lens is removed to treat cataract, clear lens extraction is done to surgically correct refractive errors ...

6. Multifocal diffractive lens - Wikipedia

   en.wikipedia.org/wiki/Multifocal_diffractive_lens

   A multifocal diffractive lens is a diffractive optical element (DOE) that allows a single incident beam to be focused simultaneously at several positions along the propagation axis. [1] Example of multifocal peak intensity distribution along optical axis.(Courtesy of Holo/Or) Intensity distribution of multifocal lens 5 foci in Z-X plane

7. Intraocular lens power calculation - Wikipedia

   en.wikipedia.org/wiki/Intraocular_lens_power...

   The aim of an accurate intraocular lens power calculation is to provide an intraocular lens (IOL) that fits the specific needs and desires of the individual patient. The development of better instrumentation for measuring the eye's axial length (AL) and the use of more precise mathematical formulas to perform the appropriate calculations have significantly improved the accuracy with which the ...