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Biomedical subjects

H Bayramlar

Publications and source records attributed to H Bayramlar.

7 recordsLinked to original sources
PubMed1999

Manual tunnel incision extracapsular cataract extraction using the sandwich technique.

Small incision extracapsular cataract extraction (ECCE) using the sandwich technique is described. After capsulorhexis, hydrodissection, and hydrodelineation, the endonucleus is moved into the anterior chamber and extracted by sandwiching it between the irrigating vectis and iris spatula. In a series of 37 eyes, most achieved a best corrected visual acuity of 5/10 or better postoperatively. Complications were posterior capsule rupture, vitreous loss, and transient corneal edema. Small incision ECCE using the sandwich technique is safe, easy, and does not require expensive instrumentation.

Adult↗
PubMed1999

Does convergence, not accommodation, cause axial-length elongation at near? A biometric study in teens.

To determine whether convergence rather than accommodation has a primary effect on the changes in axial length and other biometric components during near fixation, we measured the anterior chamber depth, lens thickness, vitreous length and axial length in the right eyes of 124 young male subjects while their left eyes focused at distance (6 m) and near (20 cm). The measurements were performed before and after cycloplegia in the right eye, so we aimed to study biometric components of the eye in the states of accommodation and nonaccommodation, but converging at near. While the left eye focused at near, the axial length increased significantly with and without cycloplegia (p < 0.0005 and p < 0.0005). The vitreous length was the main increasing ocular biometric component at near both with and without cycloplegia (p < 0.044 and p = 0.001, respectively). At near, there was no difference between two mean axial length and two vitreous length measurements both with and without cycloplegia (p = 0.672 and p = 0.595, respectively). Under cycloplegia, anterior chamber depth also increased significantly at near fixation (p = 0. 012). Axial elongation at near fixation, mainly due to an increase in vitreous length, may result from the effect of accommodative convergence rather than accommodation itself. Much use of convergence, not accommodation, may be one of the contributing factors in adult onset and adult progression of myopia.

Accommodation, Ocular↗
PubMed1998

Autonomic nervous system involvement in Behçet's disease: a pupillometric study.

The aim of this study was to elucidate whether autonomic nervous system dysfunction exists in patients with Behçet's disease by pupillometric tests. Thirty-one patients with Behçet's disease with a mean age of 41.3 years (range 21-64) and 41 control subjects with a mean age of 39.5 years (range 18-66) were selected for the study. To test the autonomic nervous system, four pupillometric techniques were used: pupil cycle time (PCT), dark-adapted pupil size (DAPS), 0.05% pilocarpine drop test, and 1% phenylephrine drop test. In all four tests, there were significant differences between the patients and controls. Mean PCTs were 1,156 ms (range 856-1,560 ms) and 919 ms (range 650-1,261 ms) in the patients and controls, respectively (p < 0.0001). The mean DAPS was 0.45 (range 0.31-0.66) in the patients, whereas it was 0.56 (range 0.42-0.67) in controls (p < 0.001). Iris sensitivity to both 0.05% pilocarpine and 1% phenylephrine showed significant differences between patients and controls, respectively (p < 0.05, p < 0.05). Among all four tests, only 0.05% pilocarpine sensitivity was correlated with the duration of Behçet's disease (p < 0.05). The results suggest that the autonomic nervous system innervating the iris is affected in Behçet's disease. This involvement may be due to the vasculitic nature of Behçet's disease.

Adult↗
PubMed1997

Caffeic acid phenethyl ester to inhibit posterior capsule opacification in rabbits.

PURPOSE: To assess whether caffeic acid phenethyl ester (CAPE) prevents posterior capsule opacification (PCO) by suppressing the transformation of the lens epithelial cells. SETTING: Departments of Ophthalmology, Chemistry, and Pathology, Turgut Ozal Medical Center, University of Inonu, Malatya, Turkey. METHODS: Twenty pigmented island rabbits having phacoemulsification in their right eyes were randomized into two groups. In group 1, 10 micrograms/ml of CAPE was added to the anterior chamber irrigating solution and a 1% solution of CAPE was injected subconjunctivally for 3 weeks postoperatively. The irrigating solution in Group 2 (control) did not include CAPE. The development of PCO was assessed weekly and its density was graded by slitlamp biomicroscopy. Histologic analysis was performed 3 months after surgery. RESULTS: Group 1 had clear capsules or minor PCO. Group 2 developed more severe PCO or complete opacification. The difference between the two groups was statistically significant (P = .04). CONCLUSION: These preliminary results indicate that CAPE is effective in suppressing PCO in pigmented rabbits and may be beneficial in clinical use in humans because it has no documented harmful effects on normal cells.

Animals↗
PubMed1995

Computed tomography dacryocystography.

Twenty-one patients with epiphora were examined by conventional dacryocystography, using Lipiodol as a contrast medium, and CT dacryocystography, using a water soluble contrast medium. In the latter, the material was not introduced under pressure but three or four drops were administered, providing a physiological method of investigation. Subsequently, CT dacryocystography provides functional information about lacrimal disorders and is easy to use.

Adult↗