Title:
【発明の名称】掌寸大自動屈折率測定器およびその眼底の位相幾何学的写像装置
Document Type and Number:
Japanese Patent JPH09507392
Kind Code:
A
Abstract:
A schematic is disclosed for an optical instrument with a compact light path for incorporation to a hand held instrument for objective refraction of the eye. In particular, and after eye centering occurs, utilizing an eye examiner to patient sight path and an automated indication of centering using conventional Purkinje images, first and second light sources electronically bracket the patient's gross sphere. Thereafter, a light source array is registered on one or the other side of the determined gross sphere prescription and analyzed for astigmatism. There results a rapid objective refraction particularly useful with children whose limited attention span renders the use of more conventional autorefractors not practicable.
Inventors:
Yang Si, Don Earl.
Application Number:
JP50055894A
Publication Date:
July 29, 1997
Filing Date:
May 07, 1993
Export Citation:
Assignee:
Yang Si, Don Earl.
International Classes:
A61B3/10; A61B3/103; A61B3/12; A61B3/14; A61B3/15; (IPC1-7): A61B3/10
Attorney, Agent or Firm:
Hidekazu Miyoshi (1 outside)