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Corneal inlay significantly improves reading performance in emmetropic presbyopes
Am J Ophthalmol. 2011;doi:10.1016/j.ajo.2011.08.044.
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Implantation of a monocular corneal inlay markedly improved reading performance and enhanced overall satisfaction with vision, a study found.
"The results of this clinical trial show that the theoretical benefit of increasing the depth of focus generates statistically significant changes in several reading performance parameters in emmetropic presbyopic patients," the study authors said.
The prospective study included 24 patients implanted with the Kamra ACI7000PDT corneal inlay (AcuFocus) in the nondominant eye. No complications or dislocations were reported.
The Kamra inlay is believed to increase depth of focus based on a pinhole effect to restore near and intermediate visual acuity, with no adverse effect on distance vision.
The inlay is inserted into a femtosecond laser-created pocket.
All patients were 45 to 60 years old with natural emmetropia and presbyopia, uncorrected distance visual acuity of at least 20/20 and no additional ocular pathologies.
The Salzburg Reading Desk was used to assess bilateral uncorrected reading acuity, reading distance, mean and maximum reading speed, and smallest log-scaled print size. The minimum postoperative follow-up interval was 12 months.
Study results showed that reading distance diminished from 46.7 cm preoperatively to 42.8 cm; the decrease was statistically significant (P < .004).
Mean reading acuity at best distance improved from 0.33 logRAD to 0.24 logRAD (P < .005). Mean reading speed increased from 141 words per minute to 156 words per minute (P < .003). The smallest print size improved from 1.5 cm to 1.12 cm (P < .001), the authors said.