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Visual performance with two frequent replacement toric hydrogel contact lens designs

1 May 2002


Many studies in the past have compared toric hydrogel lens designs with regard to vision, stability, and patient satisfaction. While each of these variables is important in the success of contact lens fitting, few studies in the literature have explored the relationship between lens design and visual performance, specifically as it relates to functional daily activities. This study was developed to identify whether or not a correlation exists between lens design and visual performance by comparing the prism ballasted Soflens 66 toric lens to the double slab-off Acuvue toric hydrogel lens. Eight subjects were fit with each lens to wear for one week, after which visual performance was assessed with the following tests: logMAR visual acuity, speed and accuracy of stereopsis, dynamic visual acuity, and accommodative facility. The subjects were also required to complete a questionnaire at the end of the week regarding the performance of each lens. It was found that due to the small sample size, there was no statistically significant difference between the two lenses with regard to many of the visual performance measurements. One question from the questionnaire pertaining to frequency of blur when shifting focus from near to far was determined to be statistically significant, showing the Acuvue toric lens design to be preferred by the subjects involved in the study. Without regard to statistical significance, it did appear that a relationship exists between lens design and visual performance, as subjects wearing the prism ballasted lens performed better than when wearing the double slab-off lens in many categories. To further validate these findings, future studies with larger sample sizes are therefore warranted.


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