LAUSR

Purpose: comparison of some ophthalmobiometric parameters in natural and cycloplegic conditions in myopia and hypermetropia. Material and methods: eyes biometric parameters were examined (the depth of the anterior chamber, the lens thickness and AL) before and after cycloplegia (1% Cyclopentolate hydrochloride — 2 times) in 244 eyes with myopic and hyperopic refraction in 122 patients aged 5–32 years. Biometric parameters were examined on the Galilei G6 optical system analyzer (Ziemer Ophthalmic Systems AG 6.0.6). The thickness of the choroid was measured with a spectral optical coherent tomograph (SD-OCT wavelength 800 nm) of Nidek RS-3000 Retina Scan Advance in 20 eyes of 10 patients aged 11 ± 1.3 years from the examined group before and 40 minutes after double injection of 1% Cyclopentolate hydrochloride. Results: the depth of anterior chamber and the axial, both in the narrow pupil and under the cycloplegia, are significantly higher in the myopic eyes than in the hyperopic eyes (p 0.05) and by 40 microns (0.04 mm) with hyperopia (p < 0.01). Conclusion: In cyclopegic condidions, as compared to the existing accommodation, increasing the depth of the anterior chamber decreased the thickness of the lens center of the lens somewhat extended posteriorly and decreases the axial length. The revealed changes in the AL can be associated with a change in the position of the pigment epithelium layer due to changes in the thickness of the choroid under different accommodation conditions. The significant changes in the thickness of the choroid the influence of cycloplegia was not proved in this study.