2. December 2013 09:38
The role of the ethnic origin of contact lens wearers is rarely considered when the effects of contact lens use are studied. To provide data on the subject, a team of researchers (Nina Tran, Andrew D. Graham and Meng C. Lin) carried out a special study comparing several aspects of contact lens wear in Asians and non-Asians.
The study included almost 400 subjects (180 of them were Asian), who were asked to stop using their contact lenses for 24 hours and undergo detailed examinations at the University of California, Berkeley Clinical Research Center.
After the collection and analysis of data, the researchers found that Asian contact lens wearers were more prone to corneal staining and had a higher average level of subjective dry eye symptoms.
The researchers concluded that Asian contact lens wearers suffered from contact lens-related dry eye syndrome more often than non-Asians and that Asian patients were more strongly affected by contact lens wear. However, more research is required to reveal the reasons for the discovered differences.
30. November 2013 09:24
According to the results of a recently published study, the newest multipurpose disinfecting solution launched by RevitaLens OcuTec, Complete RevitaLens, is effective in not only keeping contact lenses clean, but also improving their comfort.
The study was a multi-centre one and was conducted in as many as 10 countries in Europe and in the United States. Around 10 contact lens wearers were followed up at each centre for a period of a year, which gave a total number of 996 subjects in Europe and 1985 subjects in the USA. Three quarters of them used silicone hydrogel contact lenses.
In comparison with their previous lens care systems, almost 95% of the subjects considered the Complete RevitaLens solution at least 'somewhat more effective' in making contact lenses feel clean. In addition, nearly 90% of the subjects thought the new solution was at least 'somewhat more effective' in making contact lenses comfortable at the end of the day. Finally, an even larger proportion of patients (about 94%) found their vision clearer in the evening after using Complete RevitaLens.
29. November 2013 09:18
Orthokeratology is a relatively new method of vision correction, so it is being intensively studied by researchers from different academic centres. One of the most recent studies has been conducted in Turkey, at the Ankara University School of Medicine.
The Turkish researchers focused on the impact of two brands of orthokeratology contact lenses on the topography of the cornea after a year of use. They assessed the eyes of 22 patients with short-sightedness (from -1.00D to -5.00D) and fitted them with DreamLens (manufactured by Hanita Lenses Investments) or Rinehart-Reeves (manufactured by Danker Laboratories) contact lenses.
The patients were followed up for a period of a year, during which no serious eye-related complications occurred in any of them. The patients were assessed with respect to their visual acuity (corrected and uncorrected), corneal topography and manifest refraction.
After analysing all the data, the authors of the study concluded that the tested orthokeratology contact lenses are safe and effective and that their main effect on the cornea was the expected change in its shape, resulting in improved distance vision.
20. November 2013 10:39
Daily disposable contact lenses have been proven to be safe and comfortable. However, a group of researchers wanted to evaluate their performance in patients who are just beginning to wear contact lenses.
The study was twelve months long and included seventy subjects. Half of them were randomised to use 1-Day Acuvue® TruEye™ contact lenses and the other half wore no contact lenses. All of the subjects underwent visual acuity examinations at the beginning of the study, after six months and at the end of the study. In addition, the researchers checked the subjects' comfort and performed biomicroscopic examinations.
The subjective levels of vision were similar in patients wearing contact lenses and glasses. As far as comfort is concerned, there were no significant differences between the subjects from the groups, though those wearing contact lenses reported improving comfort during the first month of wear.
The authors of the study concluded that daily disposable contact lenses are a great means of vision correction also for those who have not worn any contact lenses before, offering patients excellent comfort and vision.
19. November 2013 11:14
Nepal is not a country we usually associate with people using contact lenses, but – of course – contact lenses, including coloured contacts, are worn also by patients in this part of the world. And recently, a group of local researchers conducted a study analysing contact lens-related complications occurring among patients in Nepal.
To assess which conditions were the most common and what their incidence was, the researchers retrospectively analysed over 4,000 files of contact lens wearers from Kathmandu.
In total, contact lens-related complications were found in nearly 5% of patients wearing soft contact lenses. The most common complication was contact lens induced papillary conjunctivitis and constituted approximately 37% of all complications. Other frequently occurring complications included conjunctivitis (18%), superior punctuate keratitis (16%), and meibomian gland dysfunction (9%). Microbial keratitis was found in only 3% of Nepali contact lens wearers suffering from lens-related problems. On average, complications occurred after 14 months of wear.
The researchers concluded that the incidence of contact lens-related complications was satisfactory, but the situation could be improved by educating patients and increasing the availability of eye exams.