Table 2.
Comparison of Drusen Volume to Tissue-Level Factors in Neurosensory Retina
| ETDRS Subfields* | Normalized Volume nL/mm2 | Cone/mm2 | MPOD (OD) | MPOD (OS) |
|---|---|---|---|---|
| Center | 32.9 | 54,829 | 0.33 | 0.35 |
| Inner ring | 14.4 | 10,799 | 0.09 | 0.10 |
| Outer ring | 1.7 | 4,125 | 0.01 | 0.01 |
| Center/outer | 24.6 | 13.3 | 24.6 | 23.9 |
| Center/inner | 2.3 | 5.1 | 3.6 | 3.6 |
| Inner/outer | 10.6 | 2.6 | 6.9 | 6.6 |
*
The radii of the ETDRS subfields are 0.5, 1.5, and 3.0 mm. The areas of the ETDRS subfields are 0.79, 6.28, and 21.21 mm2. If the central subfield is considered to have unit area, then the area of the inner ring is 8 and the outer ring is 27.
Drusen volume, current data for normalized soft drusen volume, baseline, nL/mm2.
Cones,39 cones/mm2 in flat-mounted normal retinas, donor age 61 to 90 years.
MPOD (OD, OS), dimensionless macular pigment optic density determined via dual wavelength autofluorescence in 30 older adults with normal maculae. Right and left eyes of the same individuals are shown.