What does hF stand for on contact lenses?

[Haydenville]

What does hF stand for on contact lenses?

[Hayes Center]

Eye doctors use the letters ""H"" and ""F"" with contact lenses to identify specific aspects of the prescription. F is an abbreviation for the power of the back of the lens, and H represents a calculation for distance. The information is needed in some cases for custom-made contact lenses.

[Hayesville]

HF on contact lenses are used to identify specific aspects of the prescription. F stand for the power of the back of the lens, and H stand for the distance at which the F correction is accurate.