What is the difference between multifocal lenses and bifocal lenses?<br />After the age of forty, the ability to adapt decreases and a person needs an additional lens with a positive force to see near or to read, and some have had to use two glasses, one for seeing far (#distances) and the second for seeing near (#reading). On forming the powers of distance and reading together in a single lens called bifocal, however there were some shortcomings:<br />Not seeing clearly at the middle distance.<br />The line of separation between the two forces causes tightness for the wearer of glasses and is a sign of aging, which is unpopular for many.<br />Sudden enlargement of the image when the eye moves from the distance segment to the reading segment.<br />To get rid of these defects, lenses known as #multi-focal lenses were used, and the correct name for them is #progressive lenses, which provide a smooth and comfortable vision from far to near without the appearance of a separation line and without sudden magnification in the image, where the lens looks like a single lens with a better aesthetic vision And better performance than Albay Focal lenses.