1. Mitchell A Jackson MD Founder/Director, Jacksoneye Lake Villa, IL USA
Aspheric Balanced Curve (ABC) IOL Technology: An Enhanced Aspheric Effect with Better Clinical Outcomes
Mitchell A Jackson MD
Founder/Director, Jacksoneye
Lake Villa, IL USA
Dr. Jackson is a consultant for Hoya Surgical

2. Coma Asymmetry mistake
If light rays refract slant on a optical surface, you will get a deformation as illustrated
Coma

3. Spherical aberration Aperture error
Abaxial rays outside of the „Gaußschen territory“ (approx. 5°around the axis) will be refracted stronger
optical axis
„Gauß territory“

4. Influence of Aspheric IOL
spherical IOL
Good DOF
Worse visual Quality ++ +
+++
negative SA IOL ++
- - 00
- Worse DOF
- Best Image Quality

5. Spherical aberration & IOLs
aberration-free
negative SA
SA = +
SA = 0
SA = -
+20.4
+20.0
+18.0
+20.0
+20.0
+20.0
+20.4
+20.0
+18.0
Power increases from center to edge
Power is uniform for all areas
Power decreases from center to edge
(B&L, Acritec,Lenstec)
(Alcon, AMO,Acritec,HOYA)

6. Clear image different between both lenses with large pupil
Effect of pupil size on Image Quality is mainly significant with large pupils
spherical aspheric
Clear image different between both lenses with large pupil

7. Angle Kappa 0.36mm ± 0.22 Visual Axis Angle Kappa (2o to 5o)
Uday Devgan, MD
Angle Kappa
(2o to 5o)
Pupillary Axis
Visual Axis
Fovea
Angle Kappa
0.36mm ± 0.22
Average of 18 studies
This slide is © Uday Devgan, MD
Mean displacement between foveal axis and center of pupil of 0.37mm mm
Rynders M, Lidkea B, Chisolm W, Thibos LN. J Opt Soc Am A 1995; 12:

8. Devices can measure both pupil size & angle kappa: Hoya iTrace and Marco OPDIII examples
Angle kappa = 0.72 mm
Angle kappa = 0.62 mm

9. Power distributions (+20.0 D) Hoya “Super-prolate” effect
Spherical IOL
Negative SA IOL
HOYA Modified 1 2 3 17 18 19 20 21
Lens Radial Distance (mm)
Power (D)
ABC=Aspheric Balanced Curve - design

10. Effect of Decentration on Contrast
Optimum settings
for a standard aspheric IOL
(under the condition of Z40 = 0.27)
Hoya’s original settings 1
0.8
0.6
Contrast
Contrast
0.4
0.2
Spheric
Aspheric
Aperture 4.0 mm
HOYA
Spatial freq 50 c/mm
0.2
0.4
0.6
Decentration (mm)
Decentration (mm)
Hoya aspheric has better contrast, compared with a standard aspheric. Even at 0.5mm decentration, Hoya aspheric has better contrast than a spherical IOL.

11. Higher-Order aberrations
0.35
preoperative
postoperative
FY-60AD (aspheric IOL)
0.30
Pupil size: 5mm
0.25
0.20
(RMS µm)
0.15
p<0.005
p<0.05
n.s.
0.10
0.05
0.00
Spherical aberration
Vertical coma
Horizontal coma

12. Aspheric Balance Curve (ABC) IOL Technology
Image Quality is the key to patient satisfaction
Coma & Spherical Aberration are the bad guys
Pupil size is not the only culprit
Beware of angle kappa (especially over 0.4 mm)
Angle kappa helpful in selecting which aspheric IOL
Hoya AF-1 “super-prolate” enhanced effect is especially advantageous in high angle kappa cases >0.4 mm
Angle kappa measurements may also be helpful in determining multifocal vs accommodating IOL selection