Table I
Average Fundus Reflectance for Ten Subjects at Three Different Sites
Wavelength (nm) | Equivalent reflectance in % (coefficient of variation in %)
|
---|
Nasal fundus | Perifovea | Fovea |
---|
445 | 1.01 (18) | 0.68 (32) | 0.23 (29) |
455 | 1.14 (14) | 0.73 (31) | 0.25 (30) |
480 | 1.44 (13) | 0.89 (31) | 0.33 (30) |
505 | 1.82 (23) | 1.20 (26) | 0.58 (26) |
522 | 1.94 (24) | 1.41 (23) | 0.94 (18) |
540 | 1.88 (18) | 1.44 (22) | 1.11 (14) |
548 | 2.04 (20) | 1.53 (23) | 1.18 (13) |
560 | 2.25 (26) | 1.61 (22) | 1.24 (14) |
565 | 2.27 (26) | 1.61 (22) | 1.26 (15) |
569 | 2.24 (23) | 1.61 (22) | 1.28 (15) |
575 | 2.20 (21) | 1.62 (22) | 1.29 (16) |
586 | 2.72 (33) | 1.88 (23) | 1.48 (18) |
595 | 4.17 (44) | 2.62 (34) | 2.11 (30) |
610 | 6.36 (47) | 3.99 (49) | 3.30 (49) |
640 | 8.46 (46) | 5.79 (55) | 4.97 (54) |
675 | 10.21 (43) | 7.70 (53) | 6.68 (52) |
705 | 11.28 (40) | 8.93 (49) | 7.83 (50) |
728 | 11.82 (38) | 9.71 (46) | 8.63 (46) |
750 | 11.94 (36) | 10.42 (43) | 9.30 (44) |
805 | 12.52 (30) | 11.27 (36) | 10.37 (38) |
Table II
Equivalent Blood Layer Thickness Calculated with Eq. (6) at 560 and 610 nm for Three Sites in Ten Subjects
Wavelength (nm) | Site | Equivalent blood layer thickness dhb in μm | Linear correlation of dhb with the P index |
---|
560 | Nasal fundus | 3.9 ± 2.7 | −0.73 | p < 0.02 |
| Perifovea | 2.1 ± 0.8 | −0.50 | n.s. |
| Fovea | 1.5 ± 0.7 | −0.08 | n.s. |
610 | Nasal fundus | 14.9 ± 6.1 | −0.90 | p < 0.0004 |
| Perifovea | 12.7 ± 6.0 | −0.92 | p < 0.0002 |
| Fovea | 12.6 ± 6.4 | −0.94 | p < 0.0001 |
Table III
Results of Regressions for ModeIIa
Parameter | Unit | Nasal fundus | Perifovea | Fovea |
---|
Dme,500 (Melanin) | D.U. | 0.64 (57) [0.00–1.24] | 1.09 (51) [0.45–2.17] | 1.16 (50) [0.51–2.20] |
dhb (Hemoglobin) | μm | 93 (61) [21–204] r = −0.63 p = 0.05 | 111 (58) [30–216] r = −0.58 n.s. | 99 (58) [32–186] r = −0.74 p < 0.02 |
Dom,420 (Ocular media) | D.U. | 0.51 (37) [0.15–0.87] r = −0.66 p < 0.04 | 0.65 (17) [0.48–0.82] r = −0.12 n.s. | 0.66 (21) [0.43–0.93] r = −0.33 n.s. |
rpe (RPE reflector) | % | 2.7 (33) [1.6–4.9] r = −0.80 p < 0.006 | 2.1 (21) [1.5–2.9] r = −0.59 n.s. | 1.7 (15) [1.3–2.1] r = −0.59 n.s. |
rsc (Sclera) | % | 14 (35) [6–22] r = −0.37 n.s. | 16 (31) [8–25] r = −0.75 p < 0.02 | 15 (33) [8.9-24.5] r = −0.73 p < 0.02 |
PRE | % | 3.52 | 4.03 | 4.58 |
AFR | — | 4254 | 3706 | 4188 |
a See text for explanation of symbols. For each group of data, bold numbers indicate the mean of ten subjects; parentheses indicate coefficient of variation; square brackets indicate range;
r represents the linear correlation coefficient of the parameter with
Dme,500; and
p represents the statistical significance of this correlation (
p = 0.05 attained with |
r| = 0.63,
n = 10). The densities are single pass through each pigment.
Table IV
Results of Regressions for Model IIIa
Parameter | Unit | Nasal fundus | Perifovea | Fovea |
---|
Drpe,500 | D.U. | 0.35 (fixed) | 0.50 (fixed) | 0.60 (fixed) |
Dme,500 (Melanin) | D.U. | 0.96 (109) [0.01–3.4] | 1.92 (122) [0.22–6.4] | 2.13 (139) [0.19–7.9] |
Dhb (Hemoglobin) | μm | 146 (42) [65–286] r = 0.12 n.s. | 182 (48) [61–321] r = 0.11 n.s. | 168 (50) [60–304] r = 0.23 n.s. |
rpe (RPE reflector) | % | 3.7 (19) [2.8–5.2] r = −0.62 n.s. | 2.9 (24) [2.2–4.2] r = −0.42 n.s. | 2.3 (16) [1.7–2.8] r = −0.35 n.s. |
Dx (Choroidal loss) | D.U. | 0.17 (58) [0.05–0.36] r = 0.59 n.s. | 0.09 (63) [0.00–0.15] r = −0.27 n.s. | 0.10 (79) [0.00–0.22] r = −0.66 p < 0.04 |
Dmp,460 (Macular pigment) | D.U. | −0.016 (208) [−0.08–0.044] r = −0.43 n.s. | 0.024 (117) [−0.02–0.08] r = −0.02 n.s. | 0.21 (26) [0.12–0.31] r = 0.52. n.s. |
PRE | % | 2.74 | 3.47 | 4.65 |
AFR | — | 6882 | 5245 | 6593 |
a See text for explanation of symbols. For each group of data, bold number indicate the mean often subjects; parentheses indicate coefficient of variation; square brackets indicate range;
r represents the linear correlation coefficient of the parameter with
Dme,500; and
p represents the statistical significance of this correlation (
p = 0.05 attained with |
r| = 0.63,
n = 10). The densities are single pass through each pigment.