Impression Cytology in Different Types of Contact Lens Users

This study compared tear function tests and cytologic changes on the conjunctival surface in asymptomatic patients wearing contact lens of different materials. Included in this study were 40 eyes wearing daily wear 4 week replacement hydrogel (H) lenses, 32 eyes wearing silicone hydrogel (SiH) lenses, 18 eyes wearing rigid gas-permeable (RGP) lenses, and 21 healthy eyes (no lenses) as the control group. Epithelial morphology of the conjunctival surface was evaluated, based on Nelson classification with conjunctival impression cytology (CIC), after the tear break-up time (TBUT) and Schirmer test were performed. The mean values of the Schirmer and TBUT tests were significantly higher in the control group than in the other lens groups (p < 0.001). Grade 0 was the most frequent CIC in the control group (66.7%) and least frequent in the SiH lens group (40.6%); grade I was least frequent in the control and RGP groups (33.3%) and most frequent in the SiH lens group (40.6%). Moreover, grade 2 was most frequent in the SiH lens group (18.8%). There was no statistically significant difference in goblet cell densities between the groups (p = 0.462). In addition to the different Schirmer and TBUT test results between contact lens wearers and healthy non-wearers, some cytologic changes may occur on the ocular surface with direct mechanical effects of contact lenses. This simple and noninvasive technique may be used to evaluate the ocular surface with regard to intolerance to contact lenses

A retrospective analysis of vision correction and safety in keratoconus patients wearing Toris K soft contact lenses

The purpose of this study was to investigate the efficacy and safety of the Toris K silicone hydrogel contact lens (SwissLens; Prilly, Switzerland) in keratoconus patients. A database with information on 50 keratoconus patients (64 eyes) fitted with Toris K soft contact lenses over a 2-year period was retrospectively reviewed. Demographic data, prefitting refraction, the reason for choosing the Toris K soft contact lens, uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), best-corrected visual acuity with a rigid gas permeable lens (BCVA RGP), best-corrected visual acuity with the Toris K lens (BCVA Toris K), and complications were evaluated. The mean age +/- standard deviation at the time of fitting was 27.92 +/- 9.86 years. The mean spherical refractive power was -4.62 +/- 6.53 dioptres, and the mean cylinder was -3.78 +/- 2.43 dioptres. The most common reason for using Toris K soft contact lenses was an inability to fit the patient with a RGP contact lens. There was a statistically significant difference between UCVA and BCVA Toris K (p = 0.0001), as well as between BSCVA and BCVA Toris K (p = 0.0001). However, there was no statistically significant difference between BCVA Toris K and BCVA RGP (p = 0.20). Superficial punctate keratitis and giant papillary conjunctivitis were the most common complications. The Toris K contact lens is a viable alternative for the optical management of all grades of keratoconus. The Toris K soft contact lens is a promising alternative for the visual rehabilitation of keratoconus patients who cannot tolerate RGP lenses or achieve a good fit

The Measurement of Intraocular Pressure in Eyes with Keratoconus Using Pascal Dynamic Contour Tonometer

Purpose: To compare Pascal dynamic contour tonometer (DCT) with other tonometric systems for measurement of intraocular pressure (IOP) in eyes with keratoconus which has thinned cornea and topographically indicated keratoconus pattern and to investigate whether central corneal thickness (CCT) affect IOP measurements or not

Tear film osmolarity in patients with thyroid ophthalmopathy

Purpose: To compare tear film osmolarity between patients with thyroid ophthalmopathy and normal healthy subjects

Effects of the rigid gas permeable contact lense use on tear and ocular surface among keratoconus patients

Purpose: To investigate changes in tear and ocular surface of patients with keratoconus using rigid gas permeable contact lenses (RGPCL) and compare them against keratoconus patients who were not using lenses as well as a control group of healthy subjects

The effect of contact lens wear on the excitability of blink reflex circuit: A prospective controlled study

This study determined whether the use of contact lenses constitutes a model for adaptive alterations. We included 8 volunteers using contact lenses and 11 volunteers as control group. The blink reflex (BR) recovery was measured using the paired- pulse technique. No differences were observed between groups in initial R2 recovery at 200, 400, 800 and 1000 ms intervals. The 600 ms measurements were lower in the contact lens group (P = 0.037). There was a decrease at 600 ms in the 1st week, which reached the value of the control group in the 1st month (P = 0.049). It was concluded that rigid gas- permeable contact lens use does not cause an increase in the excitability of the interneurons that affect the BR cycle

Effect of the Rigid Gas-Permeable Contact Lens Use on the Endothelial Cells in Patients With Keratoconus

Objectives: To compare the changes in the corneal endothelial cells of both the patients with keratoconus who use rigid gas-permeable (RGP) contact lens and who do not use any contact lens with healthy population

Comparative Analysis of Tear Film Levels of Inflammatory Mediators in Contact Lens Users

Purpose: To compare tear films levels of various inflammatory cytokines in asymptomatic contact lens (CL) users. CL users of rigid gas-permeable CLs (RGPCL) (group 1) or silicone hydrogel CLs (SiHCL) (group 2) were compared with non-CL-using healthy subjects (group 3)

Corneal Decompensation after Selective Laser Trabeculoplasty

A 64-year-old Caucasian man referred for decreased vision after selective laser trabeculoplasty (SLT). Slit lamp examination revealed diffuse corneal edema. Despite intensive topical treatment including steroids, corneal edema did not resolve; on the contrary, it advanced to bullous keratopathy. Corneal edema after SLT is an exceptionally rare complication and in all of the previous reports edema resolved with medical treatment. To the best of our knowledge, this is the first report presenting persistent corneal edema after SLT