To assess the repeatability and comparability of six anterior segment biometry parameters obtained with a novel Scheimpflug camera with a Placido disc topographer (Sirius) and slit-scanning tomography with a Scheimpflug camera (Pentacam), in a sample of 16 unoperated eyes of healthy subjects. The anterior segment was analyzed by a single examiner using the Sirius and the Pentacam analyzers. Mean simulated keratometry (Sim K), flat and steep axis keratometry (K f and K s ), central and thinnest corneal thicknesses (CCT and TCT), and anterior chamber depth (ACD) measurements were evaluated. Repeatability of three sets of measurements from each device was assessed using the coefficient of variation (CV), within-subject standard deviation, and intraclass correlation coefficient (ICC). Bonferroni-adjusted t-tests, and Bland and Altman plots were used to establish agreement between devices. For both devices the CV of repeated measurements was <0.79 %. The ICC was >0.95 in all measurements except for Sirius K s (ICC = 0.869). For all parameters evaluated, the Pentacam systematically yielded higher values, although differences were statistically significant in only three parameters-0.31 diopters for K s , 10.1 μm for CCT and 12.4 μm for TCT. In the assessment of normal corneas both devices showed overall high repeatability. Although good agreement was found in three parameters (Sim K, K f and ACD) these devices do not seem to be interchangeable for pachymetric determination.
BackgroundThe objective of this study was to determine the prevalence of symptoms of ocular surface disease and its relationship with associated risk factors in students from the University of Monterrey using Ocular Surface Disease (OSDI) questionnaire.MethodsA cross-sectional survey was conducted between October and December 2014 to assess the prevalence and risk factors for ocular surface disease in a group of students from Universidad de Monterrey in Monterrey, Mexico. The severity of the disease was measured via the Ocular Surface Disease Index (OSDI) questionnaire.ResultsThe OSDI average value was 26.85 ± 20.79 points, with 70.4% of students (579) had OSDI score higher than 12 points. Women had ocular surface disease 1.63 times more than men (OR 1.29, 95% CI 1.13,1.48). Students who used ophthalmic drops have an OR 2.00 (95% CI 1.65,2.40), and students who smoke have an OR 1.24 (95% CI 1.06,1.46). Use of contact lenses, hours in front of computer or history of refractive surgery has low-estimated effect on the probability of presenting an ocular disease.ConclusionsUniversity students have a prevalence of 70.4% of ocular surface disease (OSD). OSD was associated with gender (women have a higher prevalence), smoking and the use of eye drops. A program to modify these risk factors to reduce the prevalence is needed.
The active-fluidics Centurion phacoemulsification system achieved higher surgical efficiency than the gravity-fluidics Infiniti IP system for NII and NIII cataracts.
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