Robert Szuba is a Faculty of Physics in Adam Mickiewicz University. He did his Bachelor of Science and Master of Science in Physics. Now he is a PhD student of biophysics.
The aim of the study was to reconstruct the optical conditions inside the diabetic crystalline lens. Optical parameters of the crystalline lens were affected by homeostasis disorders associated with diabetes. The changes of optical parameters in subjects with diabetes are usually described with statistical methods and the results of these statistical analyses rarely provide clear and unequivocal results. In the case of parameters that require high sensitivity measurements, the results often turn out to be located at the borderline of statistical significance. Thus, in such cases it is necessary to use more stable and predictable equivalents of these structures. For numerical simulations, a model of crystalline lens was constructed. The model was based on geometric parameters, physiological data with gradient index (GRIN) of optical medium of the lens. The GRIN was modified according to our knowledge about changes of crystalline lens in diabetic patient. We examined refractive power and spherical aberration and their changes for possible disturbances. The present study has shown that the changes of gradient profile have the influence on the optical power of the lens and the value of spherical aberration as well. Furthermore, the study has proved the possible reduction of changes of optical parameters of the lens due to swelling by GRIN. When the lens swells, the focal length becomes shortened and spherical aberration is bigger. The results from simulation are clear because the mathematical model proves the relationship between the geometry of the lens and GRIN, and image reproduction.
Sanaa Yassin has completed her ophthalmology fellowship at the age of 29 years from King Faisal University and got her FRCS degree in ophthalmology from Royal College of Surgeons, Edinburgh and Subspecialty in Vitreoretinal Diseases and Surgery from King Fahd Hospital of the University in 1993. She is the Director of Residency Training Program of Ophthalmology in the Eastern Province for the last 5 years. She has published several papers in reputed journals and a Member of scientific and professional societies and organizations: Saudi Ophthalmological Society, American Academy of Ophthalmology, and European Vitreoretinal Society.
The aim of this study was to investigate the presence of increased macular or retinal nerve fiber layer thickness (RNFLT) in amblyopic eyes, find if the increased macular or RNFLT is related to the lack of response in amblyopic eyes, and to explore whether the increased central macular thickness (CMT) in amblyopic eyes is purely related to the hyperopia. This is a prospective descriptive study. CMT and peripapillary RNFLT were measured by spectral-domain optical coherence tomography to evaluate 60 patients with unilateral-treated amblyopia (median age 11.00 year). Patients were divided into two groups: 33 patients in recovered amblyopia group and 27 patients in persistent amblyopia group. The mean CMT in the recovered group was 247.31 (±23.4) versus 246.8 (±32.7) lm (p = 0.95) for the persistent group. The mean peripapillary RNFLT was 99.13 (±12.1) versus 99.9 (±14.9) lm (p = 0.85) for the persistent group. In anisometropic amblyopia, there was no significant difference in CMT and RNFLT in either group. Also there was no relation between the type of refractive error and CMT or RNFLT. There was no significant difference in CMT and RNFLT in amblyopic eyes for both the recovered amblyopia group and the persistent amblyopia group to explain the lack of response in persistent amblyopic eyes. Additionally there was no relation between the type of refractive error and CMT or peripapillary RNFLT.