The reversibility of UV-B induced alterations in optical properties of the rabbit cornea depends on dose of UV irradiation.

Solar UVB radiation evokes photokeratitis, accompanied by increased corneal hydration and changes in corneal transparency, resulting in increased light absorption. Corneal optical properties are disturbed and visual acuity decreased. The aim of this study was to investigate the reversibility of these UVB-induced changes.

Hydration and transparency of the rabbit cornea irradiated with UVB-doses of 0.25 J/cm(2) and 0.5 J/cm(2) compared with equivalent UVB radiation exposure reaching the human cornea from sunlight.

Purpose: Exposure of the cornea to UV radiation from sunlight evokes intraocular inflammation, photokeratitis. Photokeratitis is caused by UVB radiation. It is accompanied by changes of corneal hydration and light absorption.

The influence of various toxic effects on the cornea and changes in corneal light transmission.

Purpose: Normal corneal hydration is necessary for the maintenance of corneal transparency. Damage of the corneal epithelium or endothelium by various external influences disturbs the mechanism by which the cornea maintains normal hydration and transparency. The cornea swells, and the corneal thickness increases, resulting in increased scatter and the development of corneal opacity.

Effect of two different UVA doses on the rabbit cornea and lens.

The aim of the present paper was to examine the irradiation effect of two doses of UVA rays (365 nm) on the rabbit cornea and lens. Corneas of anesthetized adult albino rabbits were irradiated with UVA rays for 5 days (daily dose 1.01 J cm(-2) in one group of rabbits and daily dose 2.

Light absorption properties of the rabbit cornea repeatedly irradiated with UVB rays.

Under normal conditions, the cornea absorbs the majority of UVB (ultraviolet B, 280-320 nm) rays, which is very important for the protection of the inner eye against their damaging effect. Our previous studies have shown that repeated irradiation of the rabbit cornea with UVB rays for 5 days (daily dose of 1.01 J cm(- 2)) caused photokeratitis accompanied by swelling (hydration) of the corneal stroma, thinning of the corneal epithelium and decrease in antioxidants.

Results of the modified trabeculotomy in the treatment of primary congenital glaucoma.

Purpose: To evaluate the effect of trabeculotomy employing probes with curvatures more closely corresponding to variable course of Schlemm's canal.

Methods: Forty-six children with primary congenital glaucoma who underwent trabeculotomy with newly designed probes between 1990 and 1998 were evaluated retrospectively. One set of the newly designed instruments consists of 3 pairs of trabeculotomy probes, the curvatures of which correspond to corneal diameters of 10, 12, and 14 mm.