depth of focus - university of houstonvoi.opt.uh.edu/voi/wavefrontcongress/2005/presentations... ·...
TRANSCRIPT
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Depth of focusand critical pupil in anemmetropic population
H Ginis
A Pallikaris
S Plainis
University of Crete
Department of Medicine
Institute of Vision and Optics
83% circle
16.66mm
Critical pupil / 2
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Sample:• 211 individuals; VA>0.8 (176 valid‡ 352 eyes)• Emmetropes• AR, Wavefront, VA • Wavelight ALLEGRO wavefront analyser.
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Data analysis
• Aberration statistics
• Critical pupil
• Depth of Focus
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Spherical Equivalent (D)
Nu
mb
er
of
eyes
Refractive error
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Wavefront aberration
Wavefront error (m)ì
Nu
mb
er
of
eye
s
(
ì
m)Wavefront error (m)ì
Nu
mb
er
of
eye
s
(
ì
m)
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PSF vs pupil diameter (5mm-1mm)
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PSF vs wavelength (0.405 - 0.695 _m)
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83%
Polychromatic PSF dimensions
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83% circle
16.66mm
Critical pupil / 2
DOF calculation
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Calculations
• WA, Polychromatic PSF as a function of pupil diameter
• 83% circle diameter
• MAR (as circle’s radius) as a function of pupil.
• Depth of Focus at this pupil size
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MAR vs Pupil diameter (with 2nd order)(One subject : -0.7 spherical equivalent)
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MAR vs Pupil diameter (HO only)
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Results
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Critical pupil VS HO RMS
0
1
2
3
4
5
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
HO RMS [?m]
Crit
ical
Pup
il [m
m]
. .
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Depth of Focus VS HO RMS
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
HO RMS [?m]
Dep
th o
f Foc
us [D
]
.
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Average = 2.34 mmSD = 0.4926N=352 eyes
Critical pupil (Sph-Cyl corrected for 550nm)
Polychromatic Monochromatic
Average = 3.37 mmSD = 0.9445
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MAR at 3mm pupil diameter
Average = 1.5776’SD = 0.4462N=352 eyes
Average = 2.3601’SD = 0.5337
PolychromaticMonochromatic
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Depth of Focus at critical pupil
Average = 0.1476 DSD = 0.0819N=352 eyes
Average = 0.2978 DSD = 0.1209
PolychromaticMonochromatic
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Monochromatic VS polychromatic MAR
0
1
2
3
4
5
0 1 2 3 4 5
Polychromatic MAR
Mon
ochr
omat
ic M
AR
.
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0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Critical pupil (mm) a
Dep
th o
f F
ocu
s (D
)
aDOF at critical pupil vs Critical pupil
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0
1
2
3
4
5
0 1 2 3 4 5
Critical Pupil (Right eye) [mm]
Crit
ical
Pup
il (L
eft e
ye) [
mm
]
.
Polychromatic critical pupil (left/right eye)
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• Critical pupil is mostly governed by refractive errors• At the absence of refractive errors MAR vs pupil curve is not very steep near critical pupil. • Considering LCA results to a larger depth of focus associated to the increased PSF dimensions.• LCA is an aberration contributing significantly to the dimensions of the PSF in a common manner among individuals and therefore reducing the inter subject variability of parameters such as the critical pupil.
Discussion
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Summer School20– 26 June (Part I)
27 June –1 July (Part II)
Summer School20– 26 June (Part I)
27 June –1 July (Part II)
Aegean Retina1 – 3 July 2005Aegean Retina1 – 3 July 2005
HE
RA
KLIO
N – C
RE
TE
2005H
ER
AK
LION
– CR
ET
E 2005
www.EyeInstituteCrete.com