A single vision lens has the power of -3.50 -1.25 x 030 with a base curve of +6.00. What would the curves ground on the optical surface be:

To determine the curves ground on the optical surface, we need to consider how the lens power and base curve interact. The given lens has a total power of -3.50 -1.25 x 030, meaning it is a toric lens with a main meridian at 030 degrees having a power of -3.50 diopters and the other meridian at 120 degrees having a power of -4.75 diopters (since the -1.25 cylinder power is being added to the primary meridian).

When we grind the optical surface of a lens, we typically subtract the base curve from the overall power at each respective meridian. The base curve is +6.00, so we will subtract this from the calculated powers at each meridian:

1. At 030 degrees:

• The effective power is calculated as follows:

[-3.50 (the sphere power) - 0 (cylinder power not affecting the sphere direction) + 6.00 (base curve) = 2.50].

Therefore, the power at this meridian ends up being +2.50 diopters.

2. At 120 degrees:

• The calculation here will follow similarly, acknowledging that the