Akademik Veri Yönetim Sistemi
CLINICAL AND EXPERIMENTAL OPTOMETRY, cilt.102, sa.6, ss.590-595, 2019 (SCI-Expanded)
Background To assess pointwise corneal elevation changes after forced eyelid closure test (FECT) in the eyes of healthy subjects and in eyes with keratoconus. Methods Twenty-nine subjects with keratoconus and 31 healthy volunteers were evaluated. Patients with keratoconus who had corneal hydrops, apical scarring, corneal thickness <= 400 mu m, ocular surface disease, contact lens wear on the examination day and a history of corneal cross-linking were excluded. Exclusion criteria for healthy participants were spherical error > +3.00 D and < -3.00 D, corneal astigmatism > 1.50 D, corneal curvature > 47 D, ocular allergy, clinical findings and family history of keratoconus. Pentacam was performed before and after 20 seconds of FECT and raw data were extracted from the built-in software. Pointwise anterior and posterior elevation changes in the central 8 mm cornea were assessed using paired samples t-test and heat maps were constructed to reflect mean changes and statistically significant data points. Statistical significance was assumed at p < 0.01. Results Age and gender were similar between healthy subjects (24.5 +/- 1.6 years, 46.4 per cent female) and subjects with keratoconus (28.6 +/- 9.2 years, 46.4 per cent female, p = 0.19, 0.61, respectively). Healthy eyes displayed posterior depression clustering in the inferotemporal and inferonasal areas (mean change: -4.5 +/- 7.8 mu m and -5.2 +/- 9.8 mu m, respectively, all p < 0.01). In contrast, keratoconus eyes exhibited a wider area of posterior elevation clustering in the inferior cornea (mean change: 8.1 +/- 14.5 mu m, all p < 0.01) with a small extension in the inferotemporal cornea (mean change: 12.1 +/- 22.3 mu m, all p < 0.01). Conclusion FECT elicits corneal elevation changes mainly in the inferior cornea with the change being more pronounced and wider in eyes with keratoconus.