Press Release:

Lenstec Introduces the Worldıs Most Accurate IOLs Old IOL parameters no longer pass the accuracy test.

Lenstec now offers Precision Series lenses incorporated into the Softec PS mono-focal lens (.25D steps; .125D tolerance from lens to lens), and The Tetraflex Presbyopic Accommodating IOL (.2D steps; .1D tolerance from lens to lens).

Many surgeons do not know that a great degree of error potentially exists within the labeling of every standard IOL manufactured today. For any given patient, the labeling introduces a potentially significant discrepancy between the targeted and the labeled IOL power. The IOL label itself is now likely to be the greatest source of refractive error in cataract surgery.

The tolerance for error in most IOL labeling is now obsolete, and it fails todayıs refractive accuracy test. ³This is an untenable risk for surgeons who are expected to deliver uncorrected vision.² (William F. Maloney, MD, Ocular Surgery News, 9/1/05)

Refractive recalibration is necessary for todayıs refractive cataract surgery. The shift to this higher refractive standard is even more crucial within the 2+ D range of presbyopia correction, in which a refractive deviation of just 0.5 D can represent a highly significant error.

This new metric raises significantly the threshold for refractive accuracy. Surgeons are responding to the challenge. The IOLMaster from Carl Zeiss Meditec is now used by a rapidly rising 35% of respondents to the most recent survey of members of the American Society of Cataract and Refractive Surgery.

The current standards for refractive tolerances were established by the International Standardization Organization and the American National Standards Institute. .The band of error tolerance starts at ħ0.3 D and widens with increasing IOL power. The deviation of ħ0.3 D immediately introduces a potential error approaching twice that number, or 0.6 D. The increasingly wider tolerance for error in higher power implants misses completely the main premise of all presbyopia correction. Regardless of the amount of distance ametropia to be corrected, the reading focus provided must be ³added² to an accurate emmetropic distance correction. Exact emmetropia is now our requisite refractive starting point, yet it cannot be achieved except by pure luck with old standard style IOLs.