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Anterior chamber diameter measurement system from limbal ring measurement

A corneal limbus and cornea technology, applied in the field of diameter system, can solve the problem that the lens is too small for the patient

Inactive Publication Date: 2006-09-06
BAUSCH & LOMB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After ICL implantation, these problems can adversely affect the natural aqueous flow from the eye or the refractive outcome
Conversely, if the calculated limbal diameter is too small, the lens will be too small for the patient
This is also problematic as the ICL may move out of place

Method used

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  • Anterior chamber diameter measurement system from limbal ring measurement
  • Anterior chamber diameter measurement system from limbal ring measurement
  • Anterior chamber diameter measurement system from limbal ring measurement

Examples

Experimental program
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Embodiment Construction

[0010] A system for measuring the limbal diameter of an eye and for determining the iris-corner diameter will be described below.

[0011] When a beam of light is directed at or near the annular limbus region that joins the cornea to the sclera, in addition to localized scattering, a continuous ring of light can be seen emanating from the limbus. This so-called limbal ring occurs with visible and infrared illumination, but also with monochromatic light (eg, laser or LED) and continuous spectrum (eg, slit beam of white light). The irradiated limbal ring must usually appear clearly when irradiating the area directly onto the limbus. The limbal ring can also be seen, but is considerably less distinct, by indirect illumination of the limbus through iris scattering or corneal fiber optic conduction.

[0012] It is generally believed that when light hits any part of the limbus, it enters the annulus of stromal collagen fibers. These collagen fibers act as light pipes and function ...

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PUM

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Abstract

A system (10) for measuring a diameter of a limbus of an eye (12). An image recorder (14) is at a known location apart from the eye and records an illuminated limbus image. An illumination source (16) at a known location relative to the image recorder (14) illuminates the limbus. A computer device (18) connected to the image recorder (14) determines the diameter of the limbus from the recorded illuminated limbus image.

Description

technical field [0001] The present invention relates to a system for measuring the limbus to limbus diameter of an eye, and more particularly to a system for measuring the limbus diameter by illuminating the eye with a laser slit and deriving the anterior chamber diameter from the limbus diameter. Background technique [0002] In the eye care profession who dispense glasses or perform surgical procedures such as laser in situ keratectomy (LASIK) or insertion of an inter-corneal lens (ICL), a common measurement is the corneal diameter or limbus to The size of the limbus. The limbus is the junction of the cornea and the sclera, which extends around the entire periphery of the cornea. This limbal diameter measurement is used to determine the outer border diameter of the cornea and is used in conjunction with LASIK surgery or contact lens formulation. Limbal diameter measurement is also used to determine the internal lumen diameter or corner-to-corner dimension, which is criti...

Claims

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Application Information

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IPC IPC(8): A61B3/107G01B11/08A61B3/10A61B3/12A61B5/11A61F9/007
CPCA61B5/1075A61B3/117
Inventor 格雷格·D·尼文蒂莫西·N·特纳
Owner BAUSCH & LOMB INC
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