Fig. 12. Locating the far points of eyes between + 4.00 D and higher using ophthalmoscopic retinoscopy. A. The retinoscopist begins at + 4.00 D, with the sleeve all of the way up and positioned 5 cm from the subject's eye. If a sharply focused filament image on the retina is not seen, the retinoscopist then recedes until it is seen or until the retinoscope filament is in sharp focus on the cornea and eyelids. This point is called the intercept. B. If at any point the retina is in sharp focus, the far point has been located; this point is behind the cornea and approximately 33 cm in front of the retinoscope, where the rays converge in virtual space. To determine the approximate amount of hyperopia, one can estimate the distance from the cornea or from the intercept (whichever is easier). The intercept occurs at 33 cm from the cornea. The reciprocal of the distance in meters gives the power in diopters. For example, if the retinal image is in sharp focus at 28 cm from the eye and 5 cm toward the eye from the intercept, the reciprocal of 0.05 is + 20.0 D.