Spherical equivalent | Sphere | Cylinder | |
Average | −1.65D | +0.28D | −3.85D |
SD | 3.43D | 3.49D | 1.87D |
Range | −10.25 to +7.00D | −8.50 to +10.00D | 0.00 to −8.00D |
% ±1D | 30% (n=11) | 32% (n=12) | 11% (n=4) |
% ±2D | 49% (n=18) | 57% (n=21) | 22% (n=8) |
% ±3D | 68% (n=25) | 76% (n=28) | 35% (n=13) |
% >3D | 32% (n=12) | 24% (n=9) | 65% (n=24) |
D=dioptre.