What type of lens is indicated if a thickness gauge measures 0.73 mm on a rigid contact lens?

When a thickness gauge measures 0.73 mm on a rigid contact lens, it typically indicates that the lens is designed to have a certain level of optical power and curvature that correlates with the thickness measurement. In the case of rigid gas permeable lenses, thickness can have implications for the lens design and its intended correction.

A thickness of 0.73 mm is generally associated with high plus power lenses. This is because high plus lenses are thicker at the center compared to low minus lenses. High plus power lenses also have a more pronounced curvature, which can require a thicker lens for structural integrity and to provide adequate optical performance. When the center thickness is above a certain measurement, it often signifies that the lens is built to achieve a necessary magnifying effect for conditions requiring correction of hyperopia or presbyopia.

In contrast, other types of lenses such as low minus power lenses tend to have a thinner profile at the center since they are designed to diverge light rays for myopic (nearsighted) corrections. Spherical power is a broader category that does not inherently indicate thickness while toric lenses, which correct for astigmatism, also might not consistently correlate with such a specific thickness reading without additional context regarding their design and prescription parameters