To calculate the Contact Lens Effectivity (\(E\)):
\[ E = \left(\frac{S}{T}\right) \times 100 \]
Where:
Contact lens effectivity is a measure of how successful a particular brand or type of contact lens is in fitting patients' eyes. It is usually expressed as a percentage and is calculated by dividing the number of successful fits by the total number of fits attempted. A higher effectivity percentage indicates a higher success rate in fitting the contact lenses to patients' eyes. This metric is important for optometrists and ophthalmologists to evaluate the performance of different contact lenses and make informed decisions about which lenses to recommend to their patients.
Let's assume the following values:
Using the formula:
\[ E = \left(\frac{80}{100}\right) \times 100 = 80\% \]
The Contact Lens Effectivity is 80%.