Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Reexamination Certificate
2006-06-07
2010-02-02
Mai, Huy K (Department: 2873)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
C351S212000, C351S221000
Reexamination Certificate
active
07654669
ABSTRACT:
To observe interference stripes produced by tear fluid, a low magnification light source10is turned on to illuminate the outermost layer of a tear film on the cornea Ec of a subject's eye. Light reflected from the cornea Ec forms an image on a CCD16, and an interference stripes pattern18acreated by the lipid film on the cornea is displayed on a monitor18. To measure the amount of tear fluid, light-emitting elements20a, 20bof a high-magnification light source are turned on to irradiate a tear fluid meniscus Em that has accumulated on the lower eyelid portion of the anterior ocular segment. Light reflected on the surface of the meniscus Em forms an image on the CCD16,and images18b, 18cof the light-emitting elements20a, 20bare displayed on the monitor18as clear images separated by an interval D. The amount of tear fluid can be quantitatively measured by measuring the interval D. A single such structure allows interference stripes created by the tear film of the anterior ocular segment to be observed and the amount of tear fluid to be measured.
REFERENCES:
patent: 5118179 (1992-06-01), Sano et al.
patent: 2004/0263781 (2004-12-01), Suzuki et al.
Adams & Wilks
Kowa Kabushiki Kaisha
Mai Huy K
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