초록 ▼

Apparatus to control the extent of photocoagulation of the retina wherein light reflected from discrete portions (Ti) of the retina (75) in the eye is projected by a lens system (82) to individual photodiodes (D1) in an array (85) to generate electrical signals related to the light intensity reflect

Apparatus to control the extent of photocoagulation of the retina wherein light reflected from discrete portions (Ti) of the retina (75) in the eye is projected by a lens system (82) to individual photodiodes (D1) in an array (85) to generate electrical signals related to the light intensity reflected from a corresponding portion (Ti) on the retina (75) being treated. A change in the reflectance of any discrete portion (Ti) of an area on the retina relative to the reflectance of any discrete portion of the area on the retina actuates a control mechanism associated with laser (22). Upon a change to a threshold reflectance or a maximum rate of change in reflectance, a control apparatus (90) automatically adjusts parameters of treatment including power (22), focus (25) or sighting (102, 104).

대표청구항 ▼

Apparatus for performing photocoagulation of biological tissue comprising: an intensive light source for initiating coagulation; first optical means for focusing the intensive light source on an area to be irradiated; second optical means for projecting an image of the irradiated area; luminance mea

Apparatus for performing photocoagulation of biological tissue comprising: an intensive light source for initiating coagulation; first optical means for focusing the intensive light source on an area to be irradiated; second optical means for projecting an image of the irradiated area; luminance measuring means, said second optical means projecting the image of the irradiated area onto said luminance measuring means, said measuring means being adapted to detect the luminance of at least two sub-regions of a region of the tissue; processing means adapted to generate control signals indicative of the change in luminance in each sub-region; control means supplied with the control signal for controlling the parameters of irradiation; a sighting device for shifting the beam of the intensive light source across the tissue; said control means controlling the intensity of the beam of the intensive light source and the position of the beam established by the sighting device.