To calculate the contact lens vertex correction:
\[ Fc = \frac{F}{1 - xF} \]
A vertex distance correction is a power that a lens needs to focus light on the same location after it has been moved a distance \( x \). This correction is important in optometry and ophthalmology to ensure accurate vision correction when lenses are positioned at different distances from the eye.
Let's assume the following values:
Step 1: Calculate the denominator:
\[ 1 - xF = 1 - (0.01 \times 5) = 0.95 \]
Step 2: Divide the original lens power by the denominator:
\[ Fc = \frac{5}{0.95} = 5.26 \text{ diopters} \]
Let's assume the following values:
Step 1: Calculate the denominator:
\[ 1 - xF = 1 - (0.02 \times 10) = 0.80 \]
Step 2: Divide the original lens power by the denominator:
\[ Fc = \frac{10}{0.80} = 12.50 \text{ diopters} \]
