7. A() 2.18 x 101 BO 2.46 x 101 CO 2.79 x 101 DO) 3.15 x 101 EO 3.56 x 101 FO) 4.02 x 101 GO 4.54 x 101 HO 5.13 x 101 Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used. The top half of the lens is used to view distant objects and the bottom half of the lens is used to view objects close to the eye. A person can clearly see objects only if they are located between 35 cm and 180 cm away from his eyes. Bifocal lenses are used to correct his vision