Clinical analysis of the LS-312MF Mplus® intraocular lens

Résumé

PURPOSE: The purpose of the clinical trial was to analyse the far, short and intermediate distance visual acuity, contrast sensitivity and defocus curve in patients with cataract surgery and implantation of the Mplus® intraocular lens. MATERIAL AND METHODS: Prospective clinical trial of 24 eyes that underwent phacoemulsification and implantation of the Oculentis Mplus intraocular lens. Patients were evaluated intraoperatively one day, one week, and one and three months after the surgery. Far (6 m), short (33 cm) and intermediate (80 cm) distance monocular spontaneous and best corrected visual acuity were measured, as well as contrast sensitivity, pupillometry in different lighting conditions and defocus curves. The presence of dysphotopsias and personal satisfaction were also studied. RESULTS:The mean far, intermediate and short distance monocular spontaneous Snellen visual acuity one month after the surgery was 0.836±0.171, 0.731±0.130 and 0.824±0.112 respectively. Three months after the surgery the mean far and intermediate distance spontaneous visual acuity did not change, but the short distance visual acuity improved to 0.895±0.116. Contrast sensitivity was slightly reduced in high frequencies, remaining the same in medium and low frequencies. The mean depth of focus one and three months after the surgery was + 0.75 in far distance with mean Snellen visual acuity of 0.8, and +2.00/-1.00 in short distance with mean visual acuity of 0.8. The presence of dysphotopsias was observed in 20% of the eyes one month after the surgery, being reduced to 9% at three months. The mean pupil diameter measurement, made at 3 months after surgery in scotopic, mesopic and photopic conditions and its relations with the visual acuity shows that there is not statistically significant connection between visual acuity and pupil diameter variables. CONCLUSION: regarding the outcomes in far, short and intermediate distance visual acuity, the Mplus® is an efficient lens providing complete independence from glasses. The contrast sensitivity is in the normal range for healthy eyes between the ages of 20 and 55. In 50% of the cases some rotation of the lens (from 10 to 45º) could be noticed, but differences in visual acuity between these cases and the ones that kept the lens centered were not observed. Therefore the rotational displacement of the lens does not affect final visual acuity. Neuroadaptation seems to be fast and efficient, and we have not observed that short distance visual acuity may be reduced with small pupils.