Browsing by Author "Çinal, A"

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Changes in Anterior Chamber Depth and Axial Length Measurements After Radial Keratotomy
(Royal Coll Ophthalmologists, 1999) Demirok, A; Çinal, A; Simsek, S; Vasar, T; Bayram, A; Yilmaz, OF
Purpose To evaluate the changes that occur in anterior chamber depth and globe axial length after radial keratotomy (RK) surgery in cases with different degrees of myopia. Methods One hundred and twelve eyes that underwent RK were studied. The eyes were divided into two groups: 70 eyes with a correction of myopia of 4.00 D and under after RK (group 1) and 42 eyes with a correction of myopia of more than 4.00 D (group 2). Routine examinations were done in all cases. Ultrasonic biometry and central anterior chamber depth and axial length were measured pre-operatively and on the third day, second week, third month and sixth month post-operatively. Results Pre-operatively the average globe axial length was longer in group 2 than group 1. When all post-operative measurements were compared with pre-operative measurements in group 1, there was a decrease in anterior chamber depth and globe axial length, but no significant difference was found except on the third day (t = 3.15, p = 0.003). In group 2 there was an insignificant decrease in axial length but the decrease in anterior chamber depth was significant at all measurement times except for the sixth month. Conclusions Refractive changes related to biometric changes after RK are not important compared with the total refractive corrections of RK. These changes should be considered, however, when planning RK procedures.
A Comparative Study on the Effect of Radial Keratotomy in Patients Who Live at Sea Level and High Altitude
(Royal Coll Ophthalmologists, 1999) Çinal, A; Yasar, T; Demirok, A; Simsek, S; Yilmaz, ÖF
Purpose To compare the refractive and keratometric results of matched pairs of patients who underwent radial keratotomy (RK) at sea level and high altitude. Methods The results of 30 eyes that underwent RK procedures in two clinical centres at different altitude were analysed. One centre was at sea level (Istanbul) and the other at an altitude of 1720 m (Van). The patients in the two centres were matched regarding gender, age, degree of myopia, number of incisions and optic zone size. There were 15 eyes in each group. All operations were performed with a diamond blade using a Russian technique by the same surgeon. Results The mean pre-operative spherical equivalent cycloplegic refractions (SECR) were -6.33 +/- 1.15 D and -6.32 +/- 1.01 D in the Istanbul and Van groups, respectively (p = 0.96). The mean post-operative SECRs were -1.93 +/- 1.03 D and -0.28 +/- 0.57 D in the Istanbul and Van groups, respectively (p < 0.001). The mean SECR changes were 4.40 +/- 0.92 D and 6.03 +/- 1.13 D in subjects who had undergone RK at sea level and at 1720 m, respectively (p < 0.001). Conclusion These results show that a higher myopic correction can be provided in patients who undergo RK at high altitude compared with those operated on at sea level. The RK nomograms used by refractive surgeons performing RK surgery at high altitude may need to be redesigned in the light of future studies with long-term follow-up.
Effect of Sex in Branch Retinal Vein Occlusion
(Wichtig Editore, 1998) Simsek, S; Demirok, A; Çinal, A; Yasar, T
Purpose. To evaluate the effect of sex in relation to crossing numbers, arterial overcrossings and occlusion sites in patients with branch retinal vein occlusion (BRVO). Methods. Fifty-one eyes with BRVO (study group) and 48 eyes with retinal problems other than BRVO (control group) were investigated All venous occlusions were examined in detail with regard to their anatomical positions, sites and arteriovenous crossings on the retinal surrounding area two disc diameters nasally, four disc diameters temporally three disc diameters superiorly and three inferiorly from the optic disc, in the arteriovenous phase of fundus fluorescein angiography and fundus color photography. Results. The study group comprised 29 women (56.86%) and 22 men (43.14%). All occlusions were unilateral and located at the crossing areas. BRVO had arterial overcrossing in 28 eyes (96.6%) in females and 22 eyes (95.5%) in males (p > 0.005). The average numbers of crossings were 7.79 +/- 1.57 in females and 7.82 +/- 1.05 in males in the study group (p > 0.05), and respectively 7.30 +/- 1.19 and 6.95 +/- 1.13 (p > 0.05) in the control group. The average arterial overcrossing ratios were 75% in females and 71% in males in the study group (p > 0.05), and 74% and 65% in the control group (p > 0.05). Conclusions. Our data suggest that females ha ve a higher risk than males because of their arterial overcrossing ratio and BRVO prefer arterial overcrossing. However the insignificant difference between the female and male patients leads us to assume that the effect of sex on BRVO cannot be explained only by local anatomical factors since their effect is only slight.
Effects of 0.5% and 0.25% Apraclonidine on Postoperative Intraocular Hypertension After Cataract Extraction
(Wichtig Editore, 1998) Simsek, S; Demirok, A; Yasar, T; Çinal, A; Bayram, A; Yilmaz, ÖF
Purpose. We conducted a double-masked, prospective study to evaluate the effect of 0.5% and 0.25% apraclonidine on postoperative intraocular pressure (IOP) in patients undergoing extracapsular cataract extraction (ECCE) with intraocular lens (IOL) implantation. Methods. Fifty-four patients scheduled for ECCE were randomly divided into three groups of 18. The first group received one drop of 0.50% apraclonidine topically one hour before surgery and immediately after the end of the procedure. The second group received the same regimen but with 0.25% apraclonidine. The third group received artificial fears as the control group. IOP was measured 12 h preoperatively and 6 and 24 h postoperatively. All the measurements were made using the same Goldmann applanation tonometer by the same surgeon who did not know to which group the patient belonged. Results. Preoperative mean IOP was 13.66 +/- 2.76 mmHg in the first group, 14.27 +/- 2.24 mmHg in the second and 14.5 +/- 1.34 mmHg in the control group. The differences were not significant (p = 0.398). Mean IOP at the early postoperative visit (6 h) was significantly lower in the first group (17.44 +/- 4.95 mmHg) than the second (21.78 +/- 7.19 mmHg) and the control group (24.55 +/- 5.65 mmHg) (p < 0.001). Mean postoperative IOP at 24 h was again significantly lower in the first group (14.33 +/- 3.75 mmHg) than the second (17.11 +/- 14.16 mmHg) and the control group (19.61 +/- 3.20 mmHg) (p < 0.001). Conclusions. Our findings indicate that topical 0.5% apraclonidine controlled early postoperative intraocular hypertension after cataract extraction without any side effects, while the 0.25% drops were not effective.
Intraoperative Application of Mitomycin C in the Surgical Treatment of Pterygium
(Wichtig Editore, 1998) Demirok, A; Simsek, S; Çinal, A; Yasar, T
Purpose. To investigate the effectiveness of intraoperative mitomycin C in pterygium surgery. Methods. The effectiveness of intraoperatively administered mitomycin C and the occurrence of postoperative complications were evaluated in 17 patients with two recurrences of pterygium. The authors employed the "bare-sclera technique" and placed a sterile sponge soaked in a 0.02% mitomycin C solution intraoperatively in the episcleral space for 3 minutes. The control group (15 patients) underwent only surgical excision. Patients were followed for 21 to 30 months. Results. The pterygium recurred in one (5.9%) of the 17 patients in group 1 and in six (40%) of the 15 controls. Statistical analysis using Fisher's exact test showed a significant (p=0.027) reduction of recurrences of pterygium in the group treated intraoperatively with mitomycin C. No serious complications or side effects arose during the follow-up period. Conclusions. Mitomycin C administered intraoperatively can be considered an effective treatment to improve the success rate after surgical excision.
Report of a Turkish Child With Sjogren-Larsson Syndrome Associated With Peripheral Nerve Involvement
(Japanese dermatolgical Assoc, 2003) Akdeniz, N; Çalka, Ö; Anlar, Ö; Akbayram, S; Çaksen, H; Metin, A; Çinal, A
Sjogren-Larsson syndrome is a rare hereditary neurocutaneous disorder characterized by ichthyosis, spastic di- or tetra-plegia, and mild to moderate mental retardation. In this article, we present a nine-year-old girl with the classical features of the syndrome associated with peripheral nerve involvement because of its rare presentation. To the best of our knowledge, only three cases of Sjogren-Larsson syndrome with peripheral nerve involvement have been previously reported in the literature. We assume that Sjogren-Larsson syndrome involves extensive disorders of the ectodermal tissues, including the peripheral nerves as well as the skin and the central nervous system.