Clemente Paz-Filgueira and Elisa M. Colombo, "Quantifying the effect of straylight on photopic contrast sensitivity," J. Opt. Soc. Am. A 35, 1124-1130 (2018)
The visual performance of a reference group (RG) using diffuser filters was compared to a cataract-diagnosed group (CatG). Measurements of straylight (SL) parameter, photopic contrast sensitivity (CS), and visual acuity (VA) were carried out in both groups. Before the analysis, the performance of the instruments used for this purpose was tested. The RG was comprised of three healthy, young eyes (25–30 years old) while 59 subjects (aged 50–80 years old) with lens opacities were recruited for the CatG. Six diffuser conditions were tested in the RG. To discriminate between light scattering levels, SL measurements proved to be most sensitive, VA did not discriminate at all, while CS showed intermediate sensitivity. VA was not correlated with SL, while the correlation between CS and SL was significant () in both groups. Since the correlation in the RG was particularly strong, parameters of a linear regression model are presented. The behavior of CS as a function of SL was comparable to some extent between RG and CatG.
Pablo Alejandro Barrionuevo, Elisa Margarita Colombo, Meritxell Vilaseca, Jaume Pujol, and Luis Alberto Issolio J. Opt. Soc. Am. A 29(7) 1293-1299 (2012)
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Extracted from Ref. [25]. parameter for “f3020 + Lee258” was not available, and its transmittance was calculated from f3020 and Lee258 filter transmittances. Pupil diameters measured in one of the observers while wearing the filters and looking at a screen of are also provided.
Table 2.
Average and Standard Deviations of Straylight Parameter (log(SL)), Best Corrected Visual Acuity (BCVA), and Contrast Sensitivity (log(CS)) for Each Diffuser Condition of the RG and for the CatG and for Subsets of CatG
Group
Condition
BCVA
log(SL)
log(CS)
1 c.p.d.
2 c.p.d.
4 c.p.d.
8 c.p.d.
12 c.p.d.
RG
No-filter
BPM1
BPM2
Lee258
f3020
f3020 + Lee258
CatG
All,
,
,
Table 3.
Correlations between Contrast Sensitivity (log(CS)) and Straylight Parameter (log(SL)) at All Five Spatial Frequencies are Shown for RG, CatG, and the Subgroup of CatG with a
log(CS) versus log(SL)
1 c.p.d.
2 c.p.d.
4 c.p.d.
8 c.p.d.
12 c.p.d.
RG
−0.94
−0.95
−0.95
−0.94
−0.96
( value)
(0.00)
(0.00)
(0.00)
(0.00)
(0.00)
−0.67
−0.87
−0.97
−1.05
−1.05
2.82
3.36
3.57
3.34
3.25
CatG, All
−0.41
−0.56
−0.56
−0.69
−0.55
( value)
(0.00)
(0.00)
(0.00)
(0.00)
(0.00)
CatG,
−0.24
−0.42
−0.36
−0.62
−0.47
( value)
(0.00)
(0.00)
(0.00)
(0.00)
(0.00)
Pearson coefficient () and statistical significance value () are presented. Coefficients and of the linear model , fitted to RG data are also presented.
Table 4.
LSD Fisher Comparisons between Different Scattering Conditions for Variables: Best Corrected Visual Acuity, log(SL), and log(CS) in the Complete Spatial Frequency Rangea
Pairs
BCVA
log(SL)
log(CS) According to Spatial Frequencies (c.p.d.)
1
2
4
8
12
No-F versus BPM1
*
*
No-F versus BPM2
*
*
*
*
*
No-F versus Lee
*
*
*
*
*
*
No-F versus F3020
*
*
*
*
*
*
No-F versus Lee+3020
*
*
*
*
*
*
*
BPM1 versus BPM2
*
BPM1 versus Lee
*
*
*
*
*
*
BPM1 versus 3020
*
*
*
*
*
*
BPM1 versus Lee+ 3020
*
*
*
*
*
*
*
BPM2 versus Lee
*
*
*
*
*
*
BPM2 versus 3020
*
*
*
*
*
*
BPM2 versus Lee+ 3020
*
*
*
*
*
*
*
Lee versus F3020
*
*
*
Lee versus Lee+ 3020
*
*
*
*
*
*
3020 versus Lee+ 3020
*
*
*
*
*
*
Cells with an asterisk correspond to -values lower than 0.05. Blank cells correspond to -values higher than 0.05.
Table 5.
Correlations between Contrast Sensitivity (log(CS)) and Straylight Parameter (log(SL)) at All Five Spatial Frequencies are Shown for Every Observera
Subject
log(CS) versus log(SL)
1 c.p.d.
2 c.p.d.
4 c.p.d.
8 c.p.d.
12 c.p.d.
S1
0.83
0.84
0.87
0.84
0.89
−0.62
−0.85
−0.94
−1.07
−1.02
2.67
3.35
3.60
3.48
3.26
S2
0.94
0.93
0.91
0.90
0.90
−0.72
−0.88
−0.94
−1.02
−1.05
2.95
3.38
3.57
3.40
3.42
S3
0.90
0.93
0.93
0.92
0.97
−0.66
−0.86
−1.00
−1.04
−1.06
2.82
3.32
3.51
3.11
3.06
Pearson coefficient () and statistical significance value () are presented. Coefficients and of the linear model fitted to RG data are also presented.
Tables (5)
Table 1.
Straylight Parameter at 10° and Percentage of Transmittance of the Diffuser Filters Used in this Workb
Extracted from Ref. [25]. parameter for “f3020 + Lee258” was not available, and its transmittance was calculated from f3020 and Lee258 filter transmittances. Pupil diameters measured in one of the observers while wearing the filters and looking at a screen of are also provided.
Table 2.
Average and Standard Deviations of Straylight Parameter (log(SL)), Best Corrected Visual Acuity (BCVA), and Contrast Sensitivity (log(CS)) for Each Diffuser Condition of the RG and for the CatG and for Subsets of CatG
Group
Condition
BCVA
log(SL)
log(CS)
1 c.p.d.
2 c.p.d.
4 c.p.d.
8 c.p.d.
12 c.p.d.
RG
No-filter
BPM1
BPM2
Lee258
f3020
f3020 + Lee258
CatG
All,
,
,
Table 3.
Correlations between Contrast Sensitivity (log(CS)) and Straylight Parameter (log(SL)) at All Five Spatial Frequencies are Shown for RG, CatG, and the Subgroup of CatG with a
log(CS) versus log(SL)
1 c.p.d.
2 c.p.d.
4 c.p.d.
8 c.p.d.
12 c.p.d.
RG
−0.94
−0.95
−0.95
−0.94
−0.96
( value)
(0.00)
(0.00)
(0.00)
(0.00)
(0.00)
−0.67
−0.87
−0.97
−1.05
−1.05
2.82
3.36
3.57
3.34
3.25
CatG, All
−0.41
−0.56
−0.56
−0.69
−0.55
( value)
(0.00)
(0.00)
(0.00)
(0.00)
(0.00)
CatG,
−0.24
−0.42
−0.36
−0.62
−0.47
( value)
(0.00)
(0.00)
(0.00)
(0.00)
(0.00)
Pearson coefficient () and statistical significance value () are presented. Coefficients and of the linear model , fitted to RG data are also presented.
Table 4.
LSD Fisher Comparisons between Different Scattering Conditions for Variables: Best Corrected Visual Acuity, log(SL), and log(CS) in the Complete Spatial Frequency Rangea
Pairs
BCVA
log(SL)
log(CS) According to Spatial Frequencies (c.p.d.)
1
2
4
8
12
No-F versus BPM1
*
*
No-F versus BPM2
*
*
*
*
*
No-F versus Lee
*
*
*
*
*
*
No-F versus F3020
*
*
*
*
*
*
No-F versus Lee+3020
*
*
*
*
*
*
*
BPM1 versus BPM2
*
BPM1 versus Lee
*
*
*
*
*
*
BPM1 versus 3020
*
*
*
*
*
*
BPM1 versus Lee+ 3020
*
*
*
*
*
*
*
BPM2 versus Lee
*
*
*
*
*
*
BPM2 versus 3020
*
*
*
*
*
*
BPM2 versus Lee+ 3020
*
*
*
*
*
*
*
Lee versus F3020
*
*
*
Lee versus Lee+ 3020
*
*
*
*
*
*
3020 versus Lee+ 3020
*
*
*
*
*
*
Cells with an asterisk correspond to -values lower than 0.05. Blank cells correspond to -values higher than 0.05.
Table 5.
Correlations between Contrast Sensitivity (log(CS)) and Straylight Parameter (log(SL)) at All Five Spatial Frequencies are Shown for Every Observera
Subject
log(CS) versus log(SL)
1 c.p.d.
2 c.p.d.
4 c.p.d.
8 c.p.d.
12 c.p.d.
S1
0.83
0.84
0.87
0.84
0.89
−0.62
−0.85
−0.94
−1.07
−1.02
2.67
3.35
3.60
3.48
3.26
S2
0.94
0.93
0.91
0.90
0.90
−0.72
−0.88
−0.94
−1.02
−1.05
2.95
3.38
3.57
3.40
3.42
S3
0.90
0.93
0.93
0.92
0.97
−0.66
−0.86
−1.00
−1.04
−1.06
2.82
3.32
3.51
3.11
3.06
Pearson coefficient () and statistical significance value () are presented. Coefficients and of the linear model fitted to RG data are also presented.