الفهرس 
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Abstract
Though extracapsular cataract extraction with the insertion
of a rnonofocal posterior chamber IOL has effectively treated
cataract, yet the loss of accommodation becomes maximal
following this procedure.
In a trial to improve the optical performance of the
pseudophakic eye in the way that would mimic the optical
performance of the normal human crystalline lens, several
bifocal and multi focal IOLs were introduced. They provide
unaided near, intermediate and distant vision tluougth
producing more than one focal point and increasing the depth of
focus.
Line by line comparison of monofocal and multi focallOLs
shows excellent results tor distant vision with multifocal IOLs.
Also the near acuity is much better, compared with monofocal
rOLs, and more than half of the patients with multifocal IOLs
never wear glasses.
However, multifocal IO!,s have their own drawbacks.
These are mainly: poor vi sion in dim light and decreased
contrast sensitivity. These result frum the fact that the light
entering the pupil is split into two halves one coming to the near