What parameters should be ordered for Jill, who has a rigid lens with a base curve of 44.00D and a power of +3.00D sphere, requiring an over refraction of -0.50D and steepening the lens by 0.50D?

To determine the appropriate parameters for Jill's rigid lens, it is essential to understand both the current specifications of the lens and how the adjustments impact the lens prescription.

Jill's current rigid lens has a base curve of 44.00D and a power of +3.00D sphere. An over-refraction of -0.50D indicates that the current lens power is slightly too strong, which means adjustments are necessary to correct her vision. Additionally, there is a requirement to steepen the lens by 0.50D, which corresponds to changing the base curve.

When steepening the lens by 0.50D, you need to adjust the base curve from 44.00D to 44.50D. This increase in the base curve will help to improve the fit of the lens on the eye while further optimizing vision as a result of the over-refraction.

Now, concerning the power adjustment: since the over-refraction indicated a need for a slight decrease of -0.50D from +3.00D (the original lens power), this leads to a new power of +2.50D. Thus, Jill's new ideal parameters will be a base curve of 44.50D and a