Table 2 Microperimetry data by drusen size and presence of pigment
Mean sensitivity in decibels ± SD (n)
Drusen sizePigmentNo pigmentp Value
No drusen13.1 ± 3.6 (67)15.0 ± 4.5 (416)0.0012
Small (<63 μ)0.0 (0)15.6 ± 3.3 (32)na
Intermediate (63–125 μ)12.3 ± 0.6 (3)15.3 ± 4.9 (27)na
Large (>125 μ)9.6 ± 4.3 (91)11.2 ± 5.6 (157)0.0231
  • na, Not applicable as a result of lack of data.