The formula to calculate the Diopter Distance (D) is:
\[
D = \frac{1}{f}
\]
Where:
\( D \) is the diopter distance
\( f \) is the focal length in meters
Definition
Diopter Distance (D): A measure used in optics to describe the refractive power of a lens.
Focal Length (f): The distance over which parallel rays of light are brought to a focus, measured in meters.
Significance: Diopter distance is a measure used in optics to describe the refractive power of a lens. It is defined as the reciprocal of the focal length in meters. A lens with a higher diopter value has a shorter focal length and thus a greater ability to bend light. Diopter distance is commonly used in the prescription of eyeglasses and contact lenses to correct vision impairments such as myopia (nearsightedness) and hyperopia (farsightedness).
Example
Let's say the focal length (f) is 0.5 meters. Using the formula:
