Definition The refractive power of the eye is measured in the value diopter, which is abbreviated as dpt. The value of the refractive power indicates how far behind the lens the light is bundled and thus the image in the eye is brought into focus. From this it follows that dioptre is the reciprocal of … Diopters – Values
Estimation of the strength of a visual aid for If there is an age farsightedness, then there is a rule of thumb, which helps to the inaccurate estimate: The reciprocal value of the distance in meters, in which one would like to read its newspaper gladly becomes minus the reciprocal value of the distance in … Estimation of the strength of a visual aid for | Diopters – Values
An eye is farsighted if it has the visual defect of no longer being able to focus on nearby objects and thus to recognize them clearly. Farsightedness is a visual defect that is often caused by the fact that the eyeball is too short, so that the sharp image is only formed behind the retina. … Dioptres and farsightedness