A refraction study was performed of 52 pseudophakic subjects implanted with a 3M diffractive intraocular lens (IOL). Twenty patients implanted with conventional monofocal IOLs from 3M were used as controls. The refraction for distance and near was determined, corresponding to the refractive (distance vision) and diffractive (near vision) foci. Pseudoaccommodation amplitude was measured relative to the variation of visual acuity as a function of "fogging" obtained with plus and minus lenses over any required spherical cylindrical power. Results showed that the 3M diffractive IOL acted as a bifocal lens in all subjects except those whose IOLs had decentered markedly. The dioptric range allowing good vision for distance and near is much wider with the diffractive IOL than it is with a monofocal IOL. Almost perfect vision, and the satisfaction of the patients, was achieved when the distance refraction was near to emmetropia and astigmatism was minimal. However, hyperopic biometric inaccuracies were less disturbing than myopic inaccuracies.

Purpose:To compare the protective properties and ease of manipulation during cataract surgery of corneal coating with a gel (eyeDRO; AL.CHI.MI.A. S.R.L, Italy) and corneal irrigation with balanced salt solution (BSS).Methods:We analyzed the data of 51 patients receiving either eyeDRO or BSS during routine cataract surgery performed within a 20-day period in 2016. The selected parameters were intraoperative clarity and ease of manipulation; postoperative epithelial integrity; and patient discomfort.Results:Compared with BSS irrigation, eyeDRO coating significantly increased intraoperative clarity and ease of manipulation (P < 0.01). Single application was required in eyeDRO-treated eyes, whereas BSS was applied 5.3 ± 0.4 times on average (P < 0.01). Two hours postoperatively, a normal epithelium was observed in 90.0% and 60.0% of eyeDRO-coated and BSS-irrigated eyes, respectively; punctate epithelial damage was observed in 9.7% and 40.0% (P < 0.05) of eyeDRO-coated and BSS-irrigated eyes, respectively; eye irritation and foreign body sensation were experienced by 13.0% and 37.0% of eyeDRO-treated patients and by 65.0% and 100% of BSS-treated patients, respectively (P < 0.01). Twenty-four hours postoperatively, 80.0% of BSS-treated patients versus 19.0% of eyeDRO-treated patients still experienced foreign body sensation (P < 0.01).Conclusions:EyeDRO coating was shown to be a safer and more effective option than BSS irrigation in cataract surgery because single application provided optimal hydration and intraoperative clarity during the entire surgery, better preserved the corneal epithelium, and offered postoperative comfort to the patient.

Presbyopia-correcting intraocular lenses (Pr-C IOLs) can provide a full range of visual corrections for far, intermediate and near vision. It is important to evaluate the outcomes from Pr-C IOLs in order to improve our results. Experience has taught us to test for certain parameters that best correlate with the patient's real-life visual performance and satisfaction. We have developed a system to collect important pre-and post-operative data to accurately access Pr-C IOLs' effectiveness. The first parameter is the patient's visual acuity. The minimum size letter that a person can resolve at near distance is an important measure of their near vision. It is important to standardise the measurement, which has been performed well for distance acuity, but not for near acuity. The latter is regularly reported in Snellen or Jaeger number formats in the US, N numbers in the UK and Parinaud numbers in France. Due to these differing systems, no comparisons can be drawn among different studies. Our experience has also shown that patients often require a print size two or three times larger than their peak near acuity limits before they can achieve their maximum reading speed. It would be useful to have a standardised method of measuring near vision that was more easily translatable into other formats.The second parameter to consider is reading speed. In our experience, it is common for a patient not to be able to comfortably The third parameter is depth of focus. Different IOLs can be expected to perform differently at different distances when reading. The defocus curve is a very useful piece of data for us to better understand the visual performance of a specific IOL: if a Pr-C IOL is found to have a predictable defocus curve, this information can be valuable for the patient's selection and counselling. The fourth parameter to evaluate is the patient's spectacle dependency after surgery. This is a rather objective criterion -if someone does not ever use glasses, this is a very definite end-point. Likewise, the presence or absence of photic phenomena is important. Although, rather than having the patient respond either yes or no, it is much more indicative to quantify the amount and severity of these events. visual outcomes will lead to a greater standardisation of clinical methods traditionally used to measure near acuity. A High-tech New Device Eyevispod™ Helps Evaluate Refractive Lens Surgery and Other Presbyopic Surgeries On Near and Intermediate Vision Quality

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