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Purpose: To investigate the change in intraocular pressure values of cross-linking (CXL) patients due to keratoconus. Material and Methods: We evaluated prospectively the keratoconus patients to whom we planned CXL therapy. Best corrected visual acquity (BCVA), flat and steep axis of the cornea, corneal topography (Oculus Pentecam), central corneal thickness (CCT), biomicroscopy, Goldmann applanation tonometry (GAT) and Pascal Dynamic Contour Tonometry (PDCT) of the both eyes were evaluated. CXL therapy is applied for the one eye of the patient. Three months after the therapy, GAT, PDCT and CCT reevaluated. The results were analyzed using paired t test. Results: We evaluated the 28 eyes of six females and 22 males. Before therapy, the mean BCVA was 0.55±0.25, the mean flat keratometric value and the mean steep keratometric value were respectively 7.19±0.4 mm, 6.66±0.44 mm The mean age was 23.26±5.98 (13-35) and the mean CCT was 466.70±38.63 µm. Three months after therapy, the mean CCT was 454.50±47.16 µm and there was no statistically significant difference(p=0.22). The mean intraocular pressure before&after CXL therapy were evaluated. The values before and after with GAT were 10.15±2.57 mmHg and 10.66±2.21 mmHg; with PDKT were 13.71±2.12 mmHg and 14.28±2.52 mmHg respectively and there was no statistically significant difference(p=0.19, p=0.20). Discussion: The CXL therapy applied widely for stopping the aggravation of keratoconus, does not make any change on intraocular pressure. [ABSTRACT FROM AUTHOR]

Purpose: To evaluate the long-term results of rigid gas permeable (RGP) contact lenses in severe keratoconic eyes. Material and Method: Severe keratoconic eyes with RGP contact lenses were evaluated retrospectively. Results: Long-term follow-up results of RGP contact lenses applied to 59 eyes of 42 patients (25 women, 17 men) with a diagnosis of severe keratoconus were analyzed. Follow-up period was 3 to 12 years (mean: 6.57±3.60). The mean age at first exam was 25.88±9.10 years, the mean corneal curve K1 was 6.49±0.40 mm and K2 was 5.91±0.40 mm. Mean visual acuities with spectacles and contact lenses were 0.26±0.10 lines (0.63±0.20 logMAR) and 0.66±0.20 lines (0.20±0.10 logMAR), respectively. The difference between both visual acuities was statistically significant (p=0.0001). At the last visit, the mean visual acuity with RGP contact lenses was 0.68±0.20 lines (0.19±0.10 logMAR). There was no statistically significant difference in visual acuity between first and last examinations with contact lenses (p=0.32). During the long-term follow-up period, apical scarring developed in 17 eyes. Only the 2 eyes of one patient needed penetrating keratoplasty after 6 years of RGP contact lens use. Discussion: Use of RGP contact lenses should be considered before penetrating keratoplasty in cases of severe keratoconus. [ABSTRACT FROM AUTHOR]