Page 3
SPHERICAL
ASPHERIC
Peripheral light rays are defocused.
Page 4
SPHERICAL ASPHERIC
Page 5
High-end cameras use aspheric lenses…
Page 6
Ophthalmologists and Optometrists currently use aspheric lenses every day…
Page 7
Contrast Sensitivity
Low ----------------Spatial Frequency---------------High
Hig
h---
----
----
--C
ontra
st--
----
----
---L
ow
Page 8
ReSTOR 22D 5mm pupil focused at near Aspheric 22D 5mm
+22D IOL Air Force Target Images
Actual through -IOL photography at fixed image
Page 9
Contrast Sensitivity: Normal
Page 10
Contrast Sensitivity: minus 25%
Page 11
Contrast Sensitivity: minus 50%
Page 12
Contrast Sensitivity: minus 75%
Page 13
Spheric IOL Aspheric IOL
Page 14
Effect of Pupil Size
Page 15
With small pupils and good lighting, the aspheric IOL and the spheric IOL perform similarly because…
Small Pupils BLOCK the peripheral rays.
Pupil Size
Page 16
Effect of Pupil Size
Page 17
Effect of Pupil Size
With Small Pupils the Images are the same
Page 18
Effect of Pupil Size
With Large Pupils the Images are different
Page 19
The BEST image possible: Small Pupil / Bright Sunlight
Aspheric IOL is EQUAL to the regular IOL.
Page 20
The WORST image possible: Large Pupil / Dim Lighting
Aspheric IOL is BETTER than the regular IOL.
Page 21
Effect of IOL decentration
Page 22
Effect of IOL decentration
With decentered IOLs, the Aspheric IOL will outperform all spherical IOLs
Page 23
How common is IOL decentration?
Hwang IP, Clinch TE, Moshifar M, Malmquist L, Cason M, Crandall AS J Cataract Refract Surg. 1998 Nov;24(11):1505-8.
Page 24
What causes IOL decentration?
Page 25
Benefits of the AO IOL:
Increased Cost of IOL Our patients deserve the best
Drawbacks of this IOL:
Aspheric Optics Less aberrations Increased contrast sensitivity Not as affected by decentration Better image quality