Corneal measurment apparatus and a method of using the same

Inactive Publication Date: 2008-06-26
BAUSCH & LOMB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]Another aspect of the invention is directed to a method of facilitating measurement of a subject's cornea, comprising (A.) providing a plurality of apertures, (B.) projecting light toward the plurality of apertures, (C.) translating a selection aperture while maintaining the pluralit

Problems solved by technology

A problem with such apparatus is that it is difficult to accurately position an aperture to form each of the slits, and over time (after many patients) it is difficult to know the position of the slits accurately so that an accurate recreation of a cornea can be obtained.

Method used

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  • Corneal measurment apparatus and a method of using the same
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  • Corneal measurment apparatus and a method of using the same

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Embodiment Construction

[0019]FIG. 1 is a schematic plan view of an embodiment of a corneal measurement apparatus 10 according to aspects of the present invention. The corneal measurement apparatus is adapted to measure a subject's cornea C. The corneal measurement apparatus comprises two illumination projection systems 13a, 13b (including light sources 12a and 12b, respectively), two mask subsystems 100a, 100b, and an image capture subsystem 50. Mask subsystems 100a and 100b are disposed in the paths of light from illumination projection systems 13a and 13b, respectively.

[0020]Illumination projection system 13a and mask subsystem 100a are in a first arm 75a of the corneal measurement apparatus and illumination projection system 13b and mask subsystem 100b are in a second arm 75b of the corneal measurement apparatus. In the illustrated embodiment, the first arm projects slits of light onto one half of the cornea, and the second arm projects slits of light onto the other half of the cornea. For example, the...

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Abstract

A corneal measurement apparatus for measuring a subject's cornea, comprising (A.) an illumination projection subsystem comprising a light source (B.) a mask subsystem disposed in a path of light from the light source, comprising (i) a first slit mask defining a plurality of apertures, (ii) a second slit mask defining a selection aperture, (iii) a translation apparatus adapted to translate the second mask, the translation apparatus and the second slit mask being configured and arranged such that by translating the selection slit, portions of the light can be selectively transmitted through each of the plurality of apertures toward the cornea, (C.) an imaging element configured and arranged to image the plurality of apertures onto the cornea, and (D.) an image capture subsystem arranged to capture images of the portions of light after the light impinges on the cornea.

Description

FIELD OF INVENTION [0001]The present invention relates to corneal measurement apparatus, and a method of corneal measurement, and more particularly to an apparatus and method for projecting a plurality of slits of light for performing corneal measurements.BACKGROUND OF THE INVENTION [0002]Ophthalmologists and optometrists would like to have an accurate representation of subjects' eye. Such representations include, for example, one or more of a representation of a subject's corneal anterior surface, posterior surface, and corneal thickness and density, as well as anterior chamber profiles. This information may be used to prescribe contact lenses and eye glasses, and to reshape the cornea by surgical procedures or to perform other surgical procedures. Since it is not comfortable to measure these data with physical contact, remote sensing techniques are preferably used to perform the measurements. A device that measures only the front surface of a cornea is commonly referred to as corn...

Claims

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Application Information

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IPC IPC(8): A61B3/107
CPCA61B3/1005A61B3/135A61B3/107
InventorBENTLEY, JOSEPH R.LAI, MING
OwnerBAUSCH & LOMB INC