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Contact lens

A contact lens and prism technology, applied in glasses/goggles, optics, instruments, etc., can solve problems such as contact lenses are not optimal

Inactive Publication Date: 2009-08-12
领先角膜控股有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this particular wave pattern and its location are not optimal for other types of contact lenses

Method used

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Examples

Experimental program
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Embodiment Construction

[0047] In the description of the various embodiments, like reference numerals are used to refer to like features in all of the embodiments.

[0048] figure 1 A first embodiment of a contact lens 1 in an eye with an upper eyelid 2 and a lower eyelid 3 is shown. The contact lens 1 has an optical zone with a central optical zone 4 and a further presbyopia correcting optical zone 5 radially outside the central optical zone.

[0049] Around this further optical zone 5 , the contact lens 1 has an inclined ridge 6 and on the ridge below this further optical zone 5 several friction zones 7 .

[0050] figure 2 An example of a rubbing zone according to the invention is shown, wherein the SEM picture shows a rubbing zone having a sinusoidal surface with an amplitude of at least 2.5 μm and a wavelength of about 70 μm in both x and y directions. The sinusoids in this example have sub-μm precision and the surface finish is on the order of 100 nm. These types of sinusoidal surfaces can ...

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PUM

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Abstract

The invention relates to a contact lens comprising at least one area with an increased friction for an eyelid for providing grip to the eyelid for positioning the contact lens on an eye in use, wherein said friction area comprises micro scale undulations for providing friction between an eyelid and the contact lens.

Description

technical field [0001] The present invention relates to a contact lens and, in particular, to a contact lens whose position or orientation in the eye is important. Background technique [0002] In particular, soft contact lenses have addressed the problems experienced by patients who are unable to wear rigid gas permeable (RGP) contact lenses, or wear them for extended periods of time, due to initial discomfort. [0003] Bifocal and multifocal soft lenses are commonly used by people over the age of 40 who need to add reading capabilities to their contact lenses, known as presbyopia. Now, there are many multifocal lens designs on the market, but with limited success so far, due to the fact that soft lenses cannot move in the eye like RGP lenses, so the very small optical center portion of the lens must not be in one design. Not being the whole of the optical part, resulting in blurred vision and loss of contrast. [0004] The most successful design for presbyopic patients i...

Claims

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Application Information

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IPC IPC(8): G02C7/04
CPCG02C7/041G02C7/048
Inventor B·F·M·万德斯
Owner 领先角膜控股有限责任公司