Patent · US Expired

Apparatus and methods for marking the visual center of the cornea of a human eye

US4875767A · kind A · utility

13Cited by
8References
14Claims
0Family size

Inventor

Key dates

Filing dateMar 3, 1988
Grant dateOct 24, 1989
Priority date—
Expiry dateMar 3, 2008

Classification

  • Technology area (CPC A)Human Necessities
  • CPC primaryA61B2090/3937
  • WIPO fieldMedical technology
  • WIPO sectorInstruments

Abstract

An apparatus for identifying and marking the visual center of the cornea of a human eye includes a cylindrical tube for placement over the cornea of a human eye. The tube is open at one end and includes, inside the tube, a disk-shaped member having a central pinhole-sized opening near the open end of the tube. Farther from the open end of the tube are one or more illuminated disks having central pinhole-sized opacities, one in the shape of a ring, another in the shape of a dot. While a viewer focuses through the pinhole on these opacities, a movable member mounted coaxially with the tube is moved to engage and mark the central visual axis of the cornea.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.