[Changes in subfoveal choroidal thickness in myopic children who wear bifocal soft contact lenses]. / Izmenenie tolshchiny khorioidei u detei s miopiei na fone nosheniya bifokal'nykh myagkikh kontaktnykh linz.

PURPOSE: To study the changes in subfoveal choroidal thickness in children with progressive myopia who have been wearing bifocal soft contact lenses (BSCL) with an ADD power of +4.0 D for 3 months. MATERIAL AND METHODS: The study included 40 patients (80 eyes) with progressive myopia of low and moderate degrees. The main group consisted of 23 patients aged 10.04±1.5 years with an average myopia of -3.06±1.17 D, they were examined before and 3 months after vision correction with bifocal soft contact lenses Prima BIO Bi-focal («OkVision Retail¼, Russia). The control group consisted of 17 patients (34 eyes) aged 9.29±0.92 years with an average myopia of -3.05±1.5 D using single vision spectacle lenses. Cycloplegic refraction, choroidal thickness and axial length were measured in all patients before and after 3 months. Choroidal thickness was measured using the semi-automatic method on the optical coherent tomography system RS-3000 Advance 2 («Nidek¼, Japan). Axial length was measured using the optical biometer IOL Master 500 («Carl Zeiss¼, Germany). RESULTS: In the main group, subfoveolar choroidal thickness increased on average by 15.3±24.3 µm after 3 months of wearing BSCL, and in the control group it decreased on average by 9.03±28.65 µm. Comparison of changes in choroidal thickness between the main and the control groups revealed a significant difference (p<0.001). Increase in axial length of the eye in the main group was significantly less than in the control group (0.005±0.08 mm vs 0.07±0.06 mm; p<0.001). A strong negative correlation was found between changes in the axial length and subfoveolar choroidal thickness in the main group (r= -0.67), but no similar relationship was found in the control group (r= -0.13). CONCLUSION: Subfoveolar choroidal thickness increases in children wearing bifocal soft contact lenses for myopia correction.

[Peripheral refraction and retinal contour in children with myopia by results of refractometry and partial coherence interferometry].

OBJECTIVE: To determine the posterior pole contour of the eye based on the relative peripheral refractive error and relative eye length. MATERIAL AND METHODS: A parallel study was performed, which enrolled 38 children (76 eyes) with myopia from -1.25 to -10.82 diopters. The patients underwent peripheral refraction assessment with WR-5100K Binocular Auto Refractometer ("Grand Seiko", Japan) and partial coherence tomography with IOLMaster ("Carl Zeiss", Germany) for the relative eye length in areas located 15 and 30 degrees nasal and temporal from the central fovea along the horizontal meridian. RESULTS: In general, refractometry and interferometry showed high coincidence of defocus signs and values for the areas located 15 and 30 degrees nasal as well as 15 degrees temporal from the fovea. However, in 41% of patients defocus signs determined by the two methods mismatched in one or more areas. Most of the mismatch cases were mild myopia. CONCLUSION: We suppose that such a mismatch is caused by optical peculiarities of the anterior eye segment that have an impact on refractometry results.