RU1768162C - Laser device for surgical treatment of ametropia - Google Patents

Abstract

The invention relates to medical equipment, in particular to devices for the surgical treatment of laser eye ametropia. The goal is to increase accuracy and reduce the time of the operation. The device includes a laser 1 and consecutive first conical lens 2 with an external taper, negative 3 and positive 4 spherical lenses forming a telescopic lens, a second conical lens 5 with an external taper and a third conical lens 7 with an internal taper. Lenses 5 and 7 are made with additional refractive angles. All conical lenses are mounted with their bases toward the laser. The lens 5 is arranged to move it along the optical axis using the mechanism 6. After the radiation beams have passed through all the lenses while moving the lens 5, a ring of variable diameter or a central spot is formed on the cornea of the eye 8. The removal of the desired layers of the cornea is ensured by changing the energy, temporal and spatial characteristics in the device 3 il. (Л С 90-а vj О 00 «О ю

Description

The invention relates to medical equipment, in particular to laser devices for the surgical treatment of eye ametropia.

The aim of the invention is to increase accuracy and reduce the time of the operation.

In FIG. 1, its schematic diagram is presented; in FIG. removal of the desired cornea during hyperopia: in FIG. 3 -Uo with myopia. f |

The device comprises a pulsed laser 1 of the ultraviolet radiation range and an optical radiation converter in the form of successive first conical lenses 2 with external taper, negative spherical lens 3, positive spherical lens 4, second conical lens 5 with external conicity and with its mechanism moving 6 along the optical axis and the third conical lens 7 with internal taper. Lenses 3 and 4 form a telescopic lens. Conical lenses 5 and 7 are made with additional refractive angles. All conical lenses are mounted with the bases toward the laser. The patient's eye is indicated by pos. 8.

The device operates as follows. The parallel radiation beam of diameter D emerging from the laser 1 passes through a conical lens 2 and is divided into

D a two diverging beams of width cos p,

inclined to the optical axis at an angle f, the value of which is determined by the magnitude of the refractive angle of the alinza and its refractive index n of its material,

After the radiation beams pass through the lenses 3 and 4, a converging radiation beam is formed, the focus of which is located in the cornea of the eye 8. The cross section of this beam is a ring of variable thickness. When lens 5 is moved using mechanism 6, either a ring of variable diameter DI with constant thickness d and maximum diameter Dimax D or a central spot of size 2d is formed on the cornea of eye 8, the value d being determined by the characteristics of the optical radiation transducer and the position of the eye relative to the plane best installation.

Claims (1)

Removing the required layers of the cornea is provided by the choice of the radiation source and by changing its energy, temporal and spatial characteristics. The effects of radiation along the optical axis and along the periphery are different depending on the type of ametropia (Figs. 2 and 3). SUMMARY OF THE INVENTION A laser device for the surgical treatment of ametropia, comprising a pulsed ultraviolet laser and an optical radiation transducer, characterized in that, in order to increase the accuracy and reduce the time of the operation, the optical radiation transducer is made in the form of consecutive first conical lenses with an external taper , negative and positive spherical lenses forming a telescopic lens of the second conical lens with external taper and the third of the conical lens with an internal taper, the second and third conical lenses being made with additional refractive angles, while all the conical lenses are mounted with their bases towards the laser, and the second conical lens is made with the possibility of its movement along the optical axis fie.