ABSTRACT
Aims: To compare the diagnostic values of the OSDI, the Schirmer’s and tear film breakup time test to check for dry eye in healthy adult students using computers and contact lenses.Methodology: Our sample consisted of hundred (100) eyes from fifty (50) healthy adults aged 18-24 years students at the University of West Attica (25 participants were contact lens wearers, while the remaining 25 were not). All participants were exposed to a computer screen or a mobile screen. Qualitative tear measurement was performed with Tear Break-Up Time Test (TBUT), quantitative measurement of tears with Schirmer Test and use of the Ocular Surface Disease Index (OSDI).Results: During the analysis of the results, it was found that OSDI was inversely proportional to the TBUT test and the Schirmer test. 60% did not have dry eye, 34% had a mild dry eye, 4% had moderate dry eye and 2% had severe dry eye. ? statistically significant relationship existed between OSDI and the other variables as well as the TBUT test with Schirmer test (p-value <0.05).Conclusion: The OSDI questionnaire, used in conjunction with the TBUT test, was easy to perform and could be helpful in supporting the diagnosis of dry eye syndrome.
ABSTRACT
Aims: The aim of this study is to compare corneal parameters in: central corneal thickness (CCT), thinnest corneal thickness (TCT), mean radius of curvature (Rm) and anterior chamber depth (ACD) obtained from Pentacam Schiempflug and OCT Tomography imaging which are checked preoperatively and six months postoperatively after LASIK surgery.Methodology: Our sample consisted of 40 eyes. Changes in corneal dimensions were monitored before and after LASIK surgery using scheimpflug tomography (Pentacam HR) and optical coherence tomography (OCT). The parameters measured were CCT, TCT, Rm and the ACD. The results between the two techniques were compared with the Bland-Altman method.Results: During the analysis of the results, a statistically significant difference was observed between the two techniques in terms of the preoperative CCT as well as the TCT both preoperatively and postoperatively.Scheimpflug tomography gives higher values of the CCT than OCT, up to thickness 530nm, while above this it seems that OCT overestimates the thickness of the cornea. Scheimpflug tomography at the TCT seems to give higher values than OCT tomography, up to thickness 520 nm, while above that it seems that OCT tomography overestimates TCT. We have similar results postoperatively for TCT.The two techniques agree on the ACD and the Rm rating.Conclusion: How converging or different the two imaging devices are because it is important for both clinical practice and research may be a point of reference for starting a new research.