Review of development and clinical trials conclusions of the ophthalmic KrCl (223 nm) laser system is presented. Medical safety, physical and technical advantages of the new laser system in comparison with widespread ArF (193 nm) laser systems for refractive surgery are demonstrated. The method of eye virus diseases treatment by usage of the KrCI laser radiation is proposed.

The research was aimed at carrying out the comparative functional analysis of femtolaser implantation of intrastromal corneal ring segments in accordance with traditional and advanced technology. The developed method of calculating the performance, as well as surgical technique of implantation of intrastromal corneal ring segments through asymmetric entrance cuts in the corneal tunnel, allow reducing the risk of postoperative complications such as the protrusion of corneal segment. The method offered allows redistributing the biomechanical pressure put by /СЙЭ.

The study included the comparative analysis of the induced changes of the shape, thickness and optical properties of a cornea after Lasik and Epi Lasik. The changes of periphery cornea shape and optical prop erties are most evident after Lasik than after Epi Lasik.

This paper presents a study of the optical properties of the components of the stroma of the human cornea in the wavelength range 190–250nm. It is shown that absorption of 223‐nm radiation by the corneal fluid is a factor of 20 less than of 193‐nm radiation. Because of this effect, the rate and efficiency of ablation of the cornea is about a factor 2 greater for laser radiation with a wavelength of 223nm than for 193‐nm radiation. The temperature on the surface of the cornea has been measured when radiation with wavelengths 193 and 223nm is acting on it. It was found that the relative temperature increase on the surface of the cornea during ablation by wavelength 193nm was 11°C, and during ablation at 223nm only 5°C for identical parameters of operation and laser radiation. It is shown that 223‐nm radiation is preferable for performing refractive operations, as having a number of advantages over the traditionally used 193‐nm radiation.