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Toric sulcus lens

A technology of toric surface and crystal, applied in the field of toric ciliary sulcus crystal, which can solve the problem of not allowing

Inactive Publication Date: 2010-11-17
C& C VISION INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These accommodating lenses vault posteriorly in the eye and move forward to accommodate; however, their maximum forward movement does not allow the optic to contact the toric ciliary sulcus where the non-accommodating optic is placed

Method used

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  • Toric sulcus lens
  • Toric sulcus lens
  • Toric sulcus lens

Examples

Experimental program
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Embodiment Construction

[0011] Now back to the attached picture, the first is figure 1 , which provides a cross-sectional view of a human eye 10 showing portions of its structure, including the cornea 12 , iris 14 , ciliary sulcus 16 , ciliary muscle 18 , zonules 20 and capsular bag 22 . A standard adjustable IOL or standard IOL 24 implanted in the capsular bag and with optics 25 and haptics 26 is shown. The crystal 25 can be an adjustable or standard IOL.

[0012] An improvement according to the invention is the implantation of a "duplex" crystal as described above, which in figure 1 Middle is designated 30 and is a ciliary sulcus toric lens with optic 32, haptics 34, and retaining rings 36 on the ends of haptics 34 (only the left one is shown).

[0013] Figures 2a and 2b also show the structure of the doublet lens 30, with the optics 32, haptics 34 and fixation ring 36 further illustrated in Figure 2a. Crystal 30 does not have a hinge like an adjustable crystal. FIG. 2 b is a side view showing ...

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PUM

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Abstract

There is disclosed herein a 'piggyback' cylindrical (toric) intraocular lens for placement in front of an accommodating or standard intraocular lens that is already in the capsular bag of the eye. This additional lens is placed in the sulcus, which leaves a significant space between the two lenses, particularly if the lens in the capsular bag is vaulted backwards.

Description

Background technique [0001] After careful measurement of eye length and corneal curvature prior to surgery, the IOL power can be calculated to give the patient good vision, assuming they have no astigmatism. Astigmatism is usually caused by an aspheric cornea, which has two different radii. [0002] Various methods have been used to correct for asphericity, known as corneal cylinder power. These have been the main job of flattening the cornea by making cuts in the cornea, so-called limbal loose cuts. Other surgical techniques are performed by intracortical surgical excision (LASIC) or superficial keratectomy (PRK). Intraocular lenses have also been used to correct corneal cylinder power. The most common form of correction is to place a cylindrical surface on the IOL. These lenses have been placed either in the capsular zone after removal of the cortex and nucleus of the human lens, or in the posterior chamber on top of the human lens. Contact lenses have also been used to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/16
CPCA61F2/1602A61F2/1645A61F2/164A61F2/16G02B1/04
Inventor S·J.·卡明
Owner C& C VISION INT