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Therapeutic hard air-permeable cornea contact mirror

A corneal contact lens, breathable technology, applied in glasses/goggles, optics, instruments, etc., can solve problems such as no longer suitable for wearing, poor visual symptoms, unable to correct the refraction regression, etc., to improve poor visual symptoms, Correction of refractive error, reasonable structure effect

Active Publication Date: 2007-03-28
GUANGZHOU VISION OPTICS TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, after excimer laser corneal refractive surgery, the curvature of the central front surface of the patient's cornea changes, and it is no longer suitable for wearing conventional rigid gas-permeable contact lenses (RGP), so that the postoperative diopter regression and poor improvement cannot be corrected visual symptoms

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  • Therapeutic hard air-permeable cornea contact mirror

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Embodiment Construction

[0009] The present invention is described in detail below in conjunction with accompanying drawing

[0010] As shown in Fig. 1, a kind of therapeutic rigid gas permeable contact lens (CRGP) provided by the present invention is made up of optical zone 1, middle peripheral part 2, edge arc zone 3 of lens, wherein said optical zone 1 The diameter D1 is 7.0-8.5 mm, the width D2 of the middle peripheral part 2 is 1.5-1.8 mm, and the width D3 of the edge arc area 3 is 0.3-0.5 mm. The total diameter D of the lens is 10.6-13.1 mm.

[0011] As shown in Figure 2, the radius of curvature R1 of the base arc of the said optical zone 1 of the present invention is 8.7-9.2 mm; the radius of curvature R2 of the second arc of the said middle peripheral part 2 is 7.8-8.6 mm; The side arc curvature radius R3 of the arc area 3 is 11-12.5 mm. Lens center thickness CT is 0.08-0.18mm.

[0012] The therapeutic rigid gas-permeable contact lens (CRGP) provided by the present invention, by changing th...

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Abstract

The invention belongs to the cornea contact lens especially for curing the hard permeability cornea. The CRGP is made up of the optical region, the middle circle part and the side arc region of the lens. The diameter of the optical region is 7.0-8.5mm and the radius of the base arc curvature is 8.7-9.2mm; the width of the middle circle is 1.5-1.8mm, the radius of the second arc curvature is 7.8-8.6mm; the width of the side arc is 0.3-0.5mm, the radius of the side arc curvature is 11-12.5mm. the whole diameter of the lens is 10.6-13.1mm and the thickness of the center is 0.08-0.18mm. So the center of the lens has the good location to decrease the higher image error efficiently.

Description

technical field [0001] The invention belongs to a corneal contact lens, in particular to a therapeutic rigid air-permeable corneal contact lens. Background technique [0002] At present, after excimer laser corneal refractive surgery, some myopic patients may experience postoperative regression problems. At the same time, due to the irregular corneal surface, higher-order aberrations will increase, such as glare, halo, and poor night vision. , Monocular diplopia, decreased ability to drive at night and other adverse visual symptoms. These postoperative adverse visual symptoms are caused by preoperative design, intraoperative flap making process, intraoperative laser cutting process and postoperative wound healing reaction. Among patients with postoperative regression problems and adverse visual symptoms after excimer laser corneal refractive surgery, a small number of patients may consider reoperation to solve it, but most patients have undergone laser surgery after the ini...

Claims

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Application Information

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IPC IPC(8): G02C7/04
Inventor 钟兴武
Owner GUANGZHOU VISION OPTICS TECH
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