Lens on Tray

HOYA AF-1™ Optimized Aspheric™ IOL

HOYA Surgical Optics engineered the Optimized Aspheric™ IOL to provide negative spherical aberration along with a unique central power distribution that maintains image quality with misalignment. In this way, the HOYA® optic design incorporates the best features of neutral spherical aberration designs AND the best of spherical aberration designs in a single optic.

Overview

Advanced Design

Traditional “spherical” IOLs have been the cornerstone of cataract surgery for decades because they produce excellent vision and are tolerant of both tilt and decentration.

Aspheric IOLs do not increase the overall spherical aberration of the eye and thus result in a sharper focus. However, performance of these lenses drops off such that no improvement can be seen with 0.5 mm of misalignment.

IOL Misalignment

Neutral aspheric IOLs provide a consistent improvement over spherical lenses, but image quality does not reach the level achieved with perfectly centered negative aspheric IOLs. The effect of alignment of the image quality achieved with various IOLs is more fully depicted in the charts below. Interestingly, at approximately 0.35 mm of misalignment the performance of standard negative SA IOLs and neutral SA IOLs are expected to be similar.

Anatomical Misalignment

The only caveat to these optical lens strategies are that most eyes are not perfectly aligned optical systems. The apex of the cornea, or corneal vertex, is rarely perfectly aligned with the lens as shown below. This aspect of ocular alignment is not currently measured preoperatively or taken in consideration with selection of the IOL until now.

Angle Kappa and Angle Alpha

The HOYA iTrace™ Surgical Workstation, with integrated topography and ray trace wavefront aberrometry, estimates Angle Alpha as the distance between the limbal center and the corneal vertex as shown in the image below. Angle Kappa measures the deviation between the pupil center and the corneal vertex.

HOYA iTrace™ Surgical Workstation image depicting the difference between Angle Kappa and Angle Alpha.

Image Sharpness

The difference in image quality with 0.4 mm of misalignment is shown in the following image. The standard negative SA aspheric IOL and the Optimized Aspheric™ IOL show good image quality when centered, but the loss of image quality at 0.4 mm misalignment is greater for the standard negative SA aspheric IOL than for the Optimized Aspheric™ IOL. Simulated image quality through a standard negative SA aspheric IOL and the Optimized Aspheric™ IOL at 0 mm and 0.4 mm of misalignment. Greater degradation of image quality is evident with the standard negative SA IOL compared to the Optimized Aspheric™ IOL.

Improved Stability

Comparison of several pivotal studies confirm the exceptional refractive predictability achieved with the HOYA Optimized Aspheric™ IOL The percentage of cases with postop refractive spherical equivalent within 0.5 D of target has been reported to be 91% in a series of 100 eyes, which approaches the exceptional predictability reported with wavefront optimized LASIK.

Specifications

HOYA AF-1™

Model Name FY-60AD (Aspheric Blue Light Absorbing IOL)
Optic Material Hydrophobic acrylic
Optic Design Aspheric
Manufacturing Lathe-cut and tumble polished
Haptic Material PMMA
Haptic Configuration Modified-C
Dimension (Optic/OAL) 6.0 mm/12.5 mm
Power +6.0 to +30.0 D (0.5 D steps)
*A-Constant 118.4
Method of Sterilization Ethylene oxide (EO)
Injector Type iSert® Preloaded IOL System
*Diopter Range +6.0 D– +30.0D
*Model Number *PY-60AD (iSert® System sold with preloaded lens)

IS Gold Series (ISH003) with E-1 Cartridge

*+6.0 D– +30.0D

Forceps

*+6.0 D– +30.0D

*Surgeons to note before using Optimized Optical constant:

These Optimized Optical constant as derived from:
http://www.augenklinik.uni-wuerzburg.de/ulib/c1.htm as of August 2012.

This is based on surgeons experience and contribution to the collated data.

Surgeons should check for more updated Optimized Optical constant on the website before using the Optimized Optical constant.