A person with a near point of 75.0 cmcm, but excellent distant vision, normally wears corrective glasses. But he loses them while traveling. Fortunately, he has his old pair as a spare. QA:  If the lenses of the old pair have a power of +2.25 dioptersdiopters , what is his near point (measured from his eye) when he is wearing the old glasses if they rest 2.00 cmcm in front of his eye?

An office administrator realizes that she is having trouble doing her work due to eyesight problems. Her optometrist determines that without glasses she can focus clearly only on objects that lie at distances between 0.450 m and 4.00 m. The optometrist decides that the best way to handle her eyesight problems is to prescribe bifocals that will give her normal visual acuity from 25.0 cm out to infinity. After trying on several pairs of glasses frames, they agree that the glasses will be a distance of 2.20 cm from her eyes. (a) Determine the refractive power needed for the bifocal part that will correct for her nearsightedness (include the sign). D What type of lens is needed? O converging O diverging (b) Determine the refractive power needed for the bifocal part that will correct for her farsightedness (include the sign). D What type of lens is needed? O converging diverging

Suppose a person's eyes have a relaxed power of 50.62 D. Assume a 2.00 cm distance from the retina to the lens of the eye.    What is the far point of the person in m?

A near-sighted man can only focus on distances of dfar = 5.66 m or closer. What power lenses does he need in his glasses for distance vision? Your answer should be in diopters (m-1).

Consider a patient who nad Taser viSion correctiun that reduced the power 07 her eve by l6.5Diproducing normal dstant YISIon For her. what was the previous Far point o7 a patient in meters ? The power qur normal aY VIS1OD 1s 50.0 D. Tht distance of the image tormaTIon in tht eye is a.00 cm FP=? ar D. The o7 in th is 2.00 cm

q42 Mr ASHER is a nearsighted person, who has a far point of 29.0 cm. Calculate the refractive power (in D) needed for his contact lenses. Enter the numerical part of your answer to two decimal figures. Hint: Remember that the sign of the refractive power is significant.

A very myopic woman has a far point of 23.8 cm. What power contact lens (in D, when on the eye) will correct her distant vision? (Take the lens-to-retina distance to be 2.00 cm.) -0.49 D -0.04 D -2.28 D -4.20 D

A severely myopic patient has a far point of 3.38 cm. By how many diopters should the power of his eye be reduced in laser vision correction to obtain normal distant vision for him? (Assume a lens-to-retina distance of 2.00 cm.) Additional Materials OReading