Development of a system to increase afocal apochromatic zoom for ophthalmologic surgical microscope

• Grant number: 00/07584-8
• Support Opportunities: Research Grants - Innovative Research in Small Business - PIPE
• Start date: November 01, 2000
• End date: May 31, 2001
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Fatima Maria Mitsue Yasuoka
• Grantee: Fatima Maria Mitsue Yasuoka
• Company: Opto Médica Equipamentos Ltda
• City: São Carlos

Abstract

The objective of this project is to develop a system of magnification of the afocal and apochromatic zoom type to be used in an ophthalmologic surgery microscope, which is one of the products manufactured by Opto Eletrônica. This system should replace the conventional system of magnification of the Galilean type telescope that allows for only five magnifications (0.40; 0.67; 1.00; 1.50 and 2.50x). Considering the increases introduced by the lens and eyepiece, the surgical microscope has total magnifications of 05, 08, 12, 20 and 30x. With the system of increased afocal apanchromatic zoom, the surgical microscope will have available magnifications that could vary from 0.40 up to 2.50x. The optical system will consist of two positive doublets (lenses constructed of two different materials, crown or flint, the aim of which will be to minimize chromatic aberration) and two negative doublets inserted between the positive lenses, in such a manner that the two negative doublets and one positive remain fixed. Since the relative movement of the lenses is non-linear, it will be necessary to use a sophisticated mechanical system of cams. The major advantage of this type of system is that it lends itself to the automation of the surgical microscope, making it much easier to perform surgical procedures. (AU)