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Ocular Aberrations and Quality of Vision with Aspheric Single-Piece and Spherical Multi-
Piece IOL: Contra lateral Comparative Study
Ahmed Assaf MD, FRCSEd
the author of this poster have received travel expense reimbursement from AMO Company
Intraocular Lenses (IOLs)
• Spherical aberration (SA) and coma are the commonest HOAs to affect quality of vision
• Aspheric IOLs with negative SA aim to balance the positive corneal SA, thus reducing the amount of total ocular SA with respect to conventional spherical IOLs
Spherical 3-piece (Sensar AR40e) IOL
Aspheric (Tecnis 1-P, Tecnis ZCB00) IOL
OPTIC of the lens has negative spherical aberration of 0.27µm to compensate for average corneal positive spherical aberration
Purpose of the Study
• To test visual outcomes and higher ocular aberrations of aspheric (Tecnis 1-P) IOL against spherical (Sensar AR40e™) biconvex multi-piece IOL.
• Both lenses are made of hydrophobic acrylic and by the same company (AMO, Abbott Medical Optics, Santa Ana, CA)
P=0.81P<0.001
Pre OperativePre Operative Post OperativePost Operative
Mic
ron
Mic
ron
0.28±0.08
0.29±0.09
0.006±0.03
0.42±0.11
VISX ™ WaveScan Wavefront System VISX ™ WaveScan Wavefront System
SphericalSpherical(Sensar)(Sensar)
AsphericAspheric(Tecnis 1-P)(Tecnis 1-P)
SphericalSpherical(Sensar)(Sensar)
OCULUS Optikgeräte GmbH, Easygraph
AsphericAspheric(Tecnis 1-P)(Tecnis 1-P)
n=28
Spherical Aberration
P=0.88
P=0.76
Pre OperativePre Operative Post OperativePost Operative
Mic
ron
Mic
ron
0.167±0.09
0.158±0.0850.154
±0.0710.151±0.071
VISX ™ WaveScan Wavefront System VISX ™ WaveScan Wavefront System
SphericalSpherical(Sensar)(Sensar)
AsphericAspheric(Tecnis 1-P)(Tecnis 1-P)
SphericalSpherical(Sensar)(Sensar)
OCULUS Optikgeräte GmbH, Easygraph
AsphericAspheric(Tecnis 1-P)(Tecnis 1-P)
Coma
P=0.38
Pre OperativePre Operative Post OperativePost Operative
Mic
ron
Mic
ron
0.185 ± 0.12 0.162
± 0.12
0.157 ± 0.13
0.145 ± 0.12
VISX ™ WaveScan Wavefront System VISX ™ WaveScan Wavefront System
SphericalSpherical(Sensar)(Sensar)
AsphericAspheric(Tecnis 1-P)(Tecnis 1-P)
SphericalSpherical(Sensar)(Sensar)
OCULUS Optikgeräte GmbH, Easygraph
AsphericAspheric(Tecnis 1-P)(Tecnis 1-P)
P=0.47
Trefoil
Aspheric IOL (mean±SD) Spherical IOL (mean±SD) P
Sphere (D) -0.01D±0.60 -0.06D±0.67 P=0.67
Cylinder (D) -0.57D±0.30 -0.55D±0.32 P=0.84
Spherical Equivalent (D) -0.30D±0.66 -0.34D±0.74 P=0.69
LogMAR BCVA 0.046±0.01 0.053±0.09 P=0.78
Log
Cont
rast
Sen
sitiv
ity (C
S)Lo
g Co
ntra
st S
ensi
tivity
(CS)
Cycles per Degree (CPD)Cycles per Degree (CPD)
n=28 VectorVisionTM 1000E Chart
85cd/m2
6 wks postop.P=0.043
Log
Cont
rast
Sen
sitiv
ity (C
S)Lo
g Co
ntra
st S
ensi
tivity
(CS)
Cycles per Degree (CPD)Cycles per Degree (CPD)
P<0.001
P<0.001
P<0.001
P<0.001
n=28 VectorVisionTM 1000E Chart
6cd/m2
6 wks postop.
Conclusion
Aspheric (Tecnis 1-P) IOL significantly reduce ocular spherical aberration. This is reflected as improved quality of vision mainly in mesopic conditions.
No significant differences regards ocular coma and trefoil of aspheric single piece IOL compared to spherical multi-piece IOL.
Thank You
Conclusion
