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Comparative study on the effect of He-Ne laser radiation and polarized monochromatic light on the changes of the cornea after chemical burning

In this research the authors present a comparison of the influence of He-Ne laser 632 nm radiation and laser power density 0.1 mW/cm2 [exposure time: 3 minutes] and polarized monochromatic light wave length 620-640 nm upon clinical, histological and electron microscopic changes in the fron epithelium and stroma of the cornea after chemical burning. The research involved 24 rabbits [48 eyes] divided into 3 groups of 8. The histologically and electron microscopic investigations was carried out on the 5th, 10th, 15th and 21st day. In the corneas treated with He-Ne laser there was noticed earlier coping of the inflammatory process in the conjuctiva, and disappearing of the perifocal oedema and faster transparency. The histologically and electron microscopic studies show that He-Ne irradiation after chemical burning of the cornea fastens the regenerative processes compared to those not irradiated and those irradiated with polarized monochromatic light. Furthermore, earlier vascularization of the stroma and filling of the defect with epithelium is noticed in the corneas irradiated with He-Ne laser.