SU1440488A1 - Colorimetric attachment to chamber for testing colour vision - Google Patents

Abstract

The invention relates to medical instrumentation, in particular to ophthalmic devices for the diagnosis and treatment of fundus diseases. The purpose of the invention is to improve the accuracy of diagnosing the fundus state by improving the accuracy of determining the color of its areas. For this, the device contains a radiation source 1 with an optical system 2, an on / off capacitor (sensor 3, aperture 4, lens 5, neutral light filters 6, second lens 7 and color light filters 8 with their movement mechanism 9, and fiber bundle light guide 10, matching Contained with a glass plate 11 installed in the focal plane of the ocular 12. The color light filters 8 are made interference in the form of a set of filter blocks of red, yellow, blue with the ratio of individual colors 1: 0.70:: O, 0015 and areas 1: 2: 1, glued between with By interfering light filters by moving them through the light field, they achieve the necessary color mixture at the first end of the optical fiber 10, which is equal in color to the color picture of the ocular fundus viewed with the ocular 12 on the plate 11. 2 or . ff (About iip 4 About 4ib 00 00 10 iPue.i

Description

The invention relates to medical technology, in particular to ophthalmic devices, and can be used in the diagnosis and treatment of fundus diseases.

The aim of the invention is to improve the accuracy of diagnosing the state of the fundus by improving the accuracy of determining the color of its parts.

On FIGO1 shows a diagram of the console; Fig. 2 shows the layout of the filters.

The colorimetric attachment (fig1) contains the source 1 of light, the optical system 2, which includes condenser 3, diaphragm 4, lens 5, neutral light filters 6, second lens 7, interference light filters 8 with displacement mechanism 9 and fiber light guide 10, filament of the light source 1 is projected on the aperture 4;

The front end of the optical fiber 10 is installed at the back focus of the second lens 7. The luminous flux coming out of the rear end of the fiber optical fiber 10 is directed to the glass plate 11 mounted in the focal plane of the eye of the fundus camera 12, which serves to the fundus of the eye. The image of the studied fundus area is formed in the fundus camera 12 at the location of the plate 11

Interference filters 8 are a node consisting of three interference filters arranged in one plane — red 13, yellow 14 and blue 15 (FIG. 2) with a ratio of the units of these colors t: 0.7:; 0.0015 and their area is 1: 2: 1 (each of the optical filters is composed of substrate glass, colored glass and a dielectric coating providing light transmission of the entire filter in a narrow band of the spectrum).

For example, the following combinations of ivibTpOB, an interferential red filter with transmission for wavelength Lnm and dnn21nm, consisting of a K8 optical glass, a K8 coated glass (type Y11-29-24), and a standard colored glass can be used. KC11

. Yellow light filter with L nm and D 8 nm, consisting of colored glass ZhS185 narrowband filter of glass K8 with coating (type U15-29-24) and filter SZS21 with coating (111-16-29-24) o Blue filter sl 426 - 4 nm iyd 13 nm, consisting of filters ZhS21, SZS22 and narrowband filter (У11-29-24), In the filter of each color, the above elements are glued together with each other by frontal surfaces in the block.

The color measurement on the colorimeter is determined by the ratio of the areas of red (K), yellow (G) and blue (s) filters, with the introduction of which the color of the mixture C is obtained into the light flux. For each color C this setting is the only one. All a combination of three values of areas corresponds to one very specific color.

The operation with the attachment is carried out as follows.

The observer, through the eye of the fundus camera 12, sees an image of the fundus of the eye and near it — a field of comparison that leads to that part of the fundus whose color is to be measured. With the aid of neutral light filters 6, the observer distinguishes the brightness of the field by comparison with the brightness of the measured field. Then he begins to change the chromaticity of the comparison field, bringing it closer to the chromaticity of the measured floor by moving the filters 6 vertically and horizontally by means of the movement mechanism 9. During vertical flow, the ratio of red and blue in the mixture changes, while moving horizontally, the amount of yellow in relation to this ratio of red and blue.

Claims (1)

Formula Colorimetric attachment to a fundus camera containing a light source and an optical system with red, yellow and blue light filters installed with the possibility of their movement perpendicular to the optical axis, characterized in that, in order to improve the accuracy of diagnosing the fundus state by increasing the accuracy determine the color of its sections; color filters are made by interference 1440488 by the core and in the form of a set of glued ionic colors are in relation to each other frontal surfaces 1; 0.70: 0.0015, and areas - tons of filters, while the luminance is in the ratio 1: 2 J 1, /five Phi $ .2