Table 1.

Theoretical predictions of how several IOLs and human crystalline lenses decrease scotopic visual sensitivity and increase protection from blue-green type photic retinopathy

Lens	% decrease in scotopic visual sensitivity*	% increase in protection from UVR blue type phototoxicity†
75 year old crystalline lens‡	75	93
53 year old crystalline lens‡	33	86
UVR+blue absorbing IOL§	27	90
UVR-only blocking IOL, No 1¶	1.5	75
UVR-only blocking IOL, No 2**	1.6	76

*The percentage difference between the total areas under the V’_λ curve in Figure 1 and that curve convolved with the spectral transmittance of a particular lens.

†The percentage difference between the total areas under the A_λ curve in Figure 1 and that curve convolved with the spectral transmittance of a particular lens.

‡Data on human crystalline lens transmittance are from Boettner and Wolter.²⁴

§Alcon acrylic AcrySof Natural 20D lens. IOL transmittance data are from Mr Rafael Chan, Alcon Surgical Division, Forth Worth, TX, USA.

¶Alcon acrylic AcrySof MA60BM 20D lens. IOL transmittance data are from Lin et al.³¹

**Pharmacia & Upjohn poly(methylmethacrylate) 720A 20D lens. IOL transmittance data are from Lin et al.³¹