Table 3. Parameters of the fitting curves f(δ) = aE^–0.5Fδ ^0.5 of the visual threshold values measured for various retinal eccentricities. COD is an abbreviation for the coefficient of determination.

Retinal eccentricity	a (value ± standard error)	COD
0 deg	(7.1 ± 0.7) × 10–4 [W]	0.91
2.5 deg	(3.3 ± 0.2) × 10–4 [W]	0.94
5 deg	(2.8 ± 0.2) × 10–4 [W]	0.96