Navegando por Palavras-chave "Contact lenses, hydrophilic"

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    Adaptação de lente de contato gelatinosa especial para ceratocone
    (Conselho Brasileiro de Oftalmologia, 2006-08-01) Yamazaki, Ester Sakae [UNIFESP]; Silva, Vanessa Cristina Batista Da [UNIFESP]; Morimitsu, Vagner [UNIFESP]; Andrade Sobrinho, Marcelo Vicente de [UNIFESP]; Fukushima, Nelson [UNIFESP]; Lipener, César [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    PURPOSE: To evaluate the fitting and use of a soft contact lens in keratoconic patients. METHODS: Retrospective study on 80 eyes of 66 patients, fitted with a special soft contact lens for keratoconus, at the Contact Lens Section of UNIFESP and private clinics. Keratoconus was classified according to degrees of disease severity by keratometric pattern. Age, gender, diagnosis, keratometry, visual acuity, spherical equivalent (SE), base curve and clinical indication were recorded. RESULTS: Of 66 patients (80 eyes) with keratoconus the mean age was 29 years, 51.5% were men and 48.5% women. According to the groups: 15.0% were incipient, 53.7% moderate, 26.3% advanced and 5.0% were severe. The majority of the eyes of patients using contact lenses (91.25%) achieved visual acuity better than 20/40. To 88 eyes 58% were tihed with lens with spherical power (mean -5.45 diopters) and 41% with spherocylinder power (from -0.5 to -5.00 cylindrical diopters). The most frequent base curve was 7.6 in 61% of the eyes. The main reasons for this special lens fitting were due to reduced tolerance and poor fitting pattern achieved with other lenses. CONCLUSION: The special soft contact lens is useful in fitting difficult keratoconic patients by offering comfort and improving visual rehabilitation that may allow more patients to postpone the need for corneal transplant.
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    Resultados preliminares de um algoritmo para ablação de lente de contato personalizada
    (Consel Brasil Oftalmologia, 2009-03-01) Matos, Luciana de [UNIFESP]; Carvalho, Luis Alberto Vieira de [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Purpose: To develop a computer simulation for customized soft contact lenses in order to correct aberrations of higher order. Methods: Using real data from a patient diagnosed with keratoconus, which were measured using a Hartmann-Shack wavefront sensor, the thickness of the contact lenses that compensate these aberrations as well the numbers of pulses required to ablate the lenses were specifically determined for the patient. Results: The maps of correction are presented and the numbers of pulses are calculated, using a 0.5 mm beam width and a 0.3 mu m ablation depth. Conclusions: The results shown here are promising, but they should be improved so that the ablation in actual physical systems can reach the desired accuracy.