Abstract
In clinical practice, to avoid or reduce the failure rate among users of contact lenses, it is necessary to obtain a detailed patient case history, information concerning symptoms, and a complete eye examination. In addition, application of an auxiliary photographic reference scale might increase the chances of improving initial success or, for existing contact lens wearers, provide insight into the extent or severity of symptoms. Patient symptoms are often directly related to contact lens failure, which in turn is related to the quality of the pre-corneal tear film as well as the <em>wettability</em> of the contact lens surface. We describe the relationship between the quality of the tear film, with particular attention to pre-contact lens tear film, variability in contact tolerance, and the material of which the contact lens is made.
Highlights
Refractive condition was up to 8.00 diopters (D) of myopia and 4.00 (D) of hyperopia, and astigmatism was less than 0.75 D
The three lenses under investigation are denoted with letter T followed by the numbers 1, 2 and 3; C indicates control lens
By fourth lens, used as control and reference a lower dehydration rate compared to other using a photographic scale we propose a more lens, was Etafilcon A, one of the first hydrogel lenses containing HEMA+MA, HEMA and objective clinical method that can help the materials approved by the FDA for disposable polyvinyl alcohol
Summary
In order to have a more stable tear film we took the series of photographs in the morning since it has been reported that the tear film is more stable at that time of day.[33] In addition, another study has shown that the use of CL produces changes in the blinking rate, resulting in less frequent and incomplete lid closure.[34,35] the Tearscope Plus®(Keeler Ltd.) and projecting its image on the pre-lens tear film. Grade 5 corresponds to the film pre-lens in a fully altered state while grade 1 indicates an intact, stable and uniform pre-lens tear film This methodology allows us to evaluate the grade of grid deformation with the pre-lens tear film stability.[40] In addition to the photographic analysis, we administered a weekly questionnaire to each CL wearer in order to investigate the number of hours of use, obtain information on subjective comfort, and to report any symptoms. We have taken special care to note which of the two lenses caused the sensation of dryness since the main cause of discomfort
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