European cataract surgeons face the same overarching challenge that their U. colleagues do with presbyopic IOL patients: managing high expectations. Here’s a closer look at the features and optics of some popular lenses.
Diffractive lenses employ closely spaced concentric rings on one of the lens surfaces to split incoming light into multiple beams; they add together in phase at a predetermined point on the optical axis for near focus, while the overall curvature of the lens provides the distance focus (Fig. The spacing and number of the rings, as well as their step heights, vary by manufacturer and model. One critical factor is the way in which incoming light is distributed to each of the focal points of an IOL.
In clinical studies, patients with the nontoric version of AT LISA had binocular central intermediate acuity, at 70 cm, of 0.27 to 0.34 log MAR (approximately 20/38 to 20/45). “I used the [nontoric] AT LISA extensively a couple of years ago,” said Erik L.
Mertens, MD, medical director and eye surgeon at Medipolis in Antwerp, Belgium.
But no matter where a cataract surgeon practices—London, England, or New London, Conn.—the challenges of achieving high-quality vision and patient satisfaction, particularly with presbyopic patients, are the same.
What’s the best solution, if any, for intermediate vision?