A patient's eye has a maximum clear viewing distance (far point) of 0.50 m0.50\text{ m}0.50 m.
State the name of this defect of vision.
Calculate the power, in dioptres (D\text{D}D), of the correcting lens required for this eye to focus clearly on very distant objects.
An optician writes the following prescription to correct a patient's vision defect:
−3.50+1.25×120 -3.50 \quad +1.25 \quad \times 120 −3.50+1.25×120Which of the following options correctly identifies the meaning of each value in order from left to right?
