Night Contact Research Articles

Night contact lenses used for myopia - personal experience.

Objective: The purpose of this study was to assess the quality of vision of patients who have chosen orthokeratology, and to identify different incidents that occur in patients who used this type of therapy. Materials and methods: The study was conducted on a group of 10 patients who had a follow-up period of at least 4 years and presented regularly to ophthalmological check-ups. The clinical parameters that were analyzed are the following: ocular refraction before and after orthokeratology therapy, the appearance of corneal topography, the slit-lamp examination of the anterior segment of the eye, incidents determined by night contact lenses, as well as ocular comfort. Results: Issues produced by night lenses occurred in two cases due to deficient hygiene and care and in one case due to disruption of lens wear. Menicon lenses were used in 7 cases and Precilens lenses were used in 3 cases. The initial visual acuity without correction was between 0.02 and 0.7, and after orthokeratology 8 out of 10 patients had a visual acuity of 1. Conclusions: In our study, orthokeratology therapy demonstrated its efficiency in slowing myopia progression and no severe complication was observed during the follow-up period.

Study of Myopia Correction Using Nanoporous Polymer Gas Permeable Contact Lenses

Ophthalmic treatments using contact lenses are now used by more and more specialists around the world. Improving contact lens (CL) materials is a condition that is constantly evolving. Contact lens materials are usually composed of polymer hydrogel or silicone hydrogel. The materials used for night contact lenses are gas permeable and they gradual flatten the center of the cornea which decreases the progression of myopia or myopic astigmatism. The aim of this study is to identify, in correlation with the chemical interactions between structural components of contact lenses and their biocompatibility with the surface layer and microtopography of the cornea or sclera, different incidents that occur in patients who have used rigid gas permeable contact lenses. The study was performed on a group of 10 patients who had a follow-up period between 4 and 6 years, who presented regularly for eye examinations. The following clinical parameters were analyzed: ocular refraction before and after wearing night contact lenses, types of contact lens materials, appearance of corneal topography, biomicroscopic examination of the anterior segment of the eye, keratometry, ocular comfort, as well as other incidents regarding this type of lenses. Difficulties caused by wearing contact lenses at night arose due to poor hygiene and maintenance in two cases or due to interruption of lens wear in one case.

Possibility of Using Nuclear Track Membrane for Ophthalmology

This work is devoted to study the possibility of using a nuclear track membrane for ophthalmology in epithelial-endothelial corneal dystrophy treatment. Experiments were conducted using the track membrane “TOMTREK” based on polyethylenterephthalate (PET) with pores diameters (0.2-0.8)micron and (5x106-2x109) pores/cm2 density. The pores were formed by irradiating the polymer PET 40Ar+8 ions with energy 41.5 MeV. After irradiation, the membrane was chemically treated in the alkaline solution. Imparting hydrorhilicity membrane was the next step. Contact angle of the wettability the surface track membrane was measured just after the chemical treatment in NaOH and after 10 hours in air. The surface had been processed by the plasma self-sustained volume discharge to give the surface the hydrorhilic properties of the membrane. The maximum voltage on plasma discharge was 20-22 kV. The energy density in the discharge was 6·10-4 J/cm2 per pulse. Pulse repetition rate was 103 s-1. Samples of 6x6 cm were attached in a special rotating device. Thus, the effects were both surfaces of the membrane. After surface treatment, TM samples were placed in plastic bags. After a night contact angle of wetting was measured with these samples. Disks treating by the plasma were cut. The disk’s diameter was 6-8 cm. The edges of the disks were incised and processed with hot temperature in order to obtain the model of an appropriate shape. It was a shape of a truncated sphere with a certain radius of curvature. Then, the membrane was sterilized and implanted into the anterior chamber of the pig’s eye. Thus, we tested the methods of barrier keratoplasty using the nuclear track membrane.