Maliheh Karimpour; Nasrin Moghadas Sharif; Naser Shoeibi; Negareh Yazdani; Asieh Ehsaei
Abstract
Introduction:The present study aimed to compare the anterior segment measurements between optical low-coherence reflectometry (LenStar LS900) and anterior segment optical coherence tomography (CASIA2 OCT). Methods:A total of 198 right eyes of 198 healthy participants were used for the current study, ...
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Introduction:The present study aimed to compare the anterior segment measurements between optical low-coherence reflectometry (LenStar LS900) and anterior segment optical coherence tomography (CASIA2 OCT). Methods:A total of 198 right eyes of 198 healthy participants were used for the current study, according to the inclusion and exclusion criteria. Ocular biometry parameters, such as central corneal thickness (CCT), anterior chamber depth (ACD), keratometry, and anterior chamber width (ACW), were measured usingLenStar LS 900 and CASIA2 OCT. The differences and correlations were assessed between these two instruments. The agreement was calculated as the 95% limits of agreement (LoA). Results: Among 198 subjects with a mean age of 29.39±7.88 years who enrolled in the study, 106 individuals (53.5%) were women. The mean CCT values were 531.7±35.25 and 527.3±37.82 µm for LenStar and OCT, respectively (P˂0.0001). The ACD measurements showed 2.92±0.40 and 2.95±0.43 mm for LenStar and OCT, respectively (P=0.0549). The ACW mean values were 12.04±0.52 and 11.79±0.49 mm by LenStar and OCT (P˂0.0001). The 95% LoA between the two instruments were within the ranges of -20.79 to 29.43 µm, -0.50 to -0.43 mm, -0.32 to 0.82 mm, and -0.70 to 0.87 D for CCT, ACD, ACW, and astigmatism, respectively. Conclusion: LenStar and OCT showed to have interchangeable ACD measurements; however, the results of CCT, ACW, and corneal astigmatism measured by these two instruments demonstrated clinically significant differences
Negareh Yazdani; Nasrin Moghadas Sharif; Maliheh Karimpour; Asieh Ehsaei
Abstract
Introduction: This study aimed to determine the influence of age and gender on pupil size under different illuminance conditions in emmetropic and myopic healthy eyes using Keratograph 4 topography. Methods: This study investigated 221 eyes of 221 subjects. After complete ocular examination, the undilated ...
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Introduction: This study aimed to determine the influence of age and gender on pupil size under different illuminance conditions in emmetropic and myopic healthy eyes using Keratograph 4 topography. Methods: This study investigated 221 eyes of 221 subjects. After complete ocular examination, the undilated pupil diameters were measured using a pupilometer and Keratograph 4 software (OCULUS, Wetzlar, Germany) with a sequence of 9.8 seconds of the scotopic stimulus (0.1 lux) and 0.2 seconds of the photopic stimulus (150 lux) repeated 5 times automatically. At the end of the procedure, the software provided maximum and minimum values (scotopic and photopic) of the pupil diameter. The age, gender, and refraction related changes of the pupil size were evaluated in different illuminance conditions. Results: Out of 221 participants in this study, 122 (85 female) and 99 (66 female) cases were myopes (MSE: -2.18±1.69 D, age: 26.03±6.98 years) and emmetropes (MSE: -0.11±0.27 D, age: 28.05±10.17 years), respectively. Considering refractive groups, pupil size was larger in myopes, compared to the emmetropes in both illuminance conditions (p <0.001). Moreover, the pupil size was found to be independent of gender in both photopic and scotopic conditions (P=0.71 and P=0.55, respectively). Additionally, a significant decrease was observed in pupil size with increasing age (p <0.001). Conclusion: This study showed that pupil size is influenced by age, illumination levels, and refractive status. These findings are important in both the optical industry and clinical decision-making process regarding treatment management.
Zahra Ameri Golestan; Nasrin Moghadas Sharif; Nasser Shoeibi; Asieh Ehsaei; Alireza Eslampour; Maryam Kadkhoda; Javad Heravian Shandiz
Abstract
Introduction: This study aimed to investigate the effect of phacoemulsification on macular thickness and volume in diabetic patients without retinopathy using optical coherence tomography (OCT).Methods: This prospective study included 37 diabetics and 55 non-diabetic patients (n=92) with cataract who ...
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Introduction: This study aimed to investigate the effect of phacoemulsification on macular thickness and volume in diabetic patients without retinopathy using optical coherence tomography (OCT).Methods: This prospective study included 37 diabetics and 55 non-diabetic patients (n=92) with cataract who were scheduled for phacoemulsification. The participants were entered into the study based on the inclusion and exclusion criteria following a complete eye examination. Macular thickness and volume were measured preoperatively as well as one month postoperatively using the OCT (Spectralis; Heidelberg Engineering, Heidelberg, Germany).Results: The present study analyzed 76 eyes of 76 patients with immature cataract. No significant differences were observed between diabetic and non-diabetic groups in terms of thickness and volume in the macular area. However, the results showed a significant increase in both groups regarding the thickness and volume after phacoemulsification. Conclusion: The results of the present study reveal that diabetes has no effects on the changes in macular thickness and volume after cataract surgery in diabetic eyes without retinopathy.