Bifocal intraocular lens (IOL)
The bifocal intraocular lens divides the light into two separate focal points: one for distance vision and another for near vision.
The lens therefore corrects near and distance vision but provides limited intermediate vision. Intermediate vision is important for many everyday tasks, such as working on a computer, cooking or inserting a key into a lock.
With this type of lens very little light is allocated for intermediate vision. Therefore, your vision is less effective when objects are situated at arm's reach (intermediate distance).
Thus, glasses may be required for certain tasks, such as working on a computer. The lens provides good vision at a short distance (32 to 39 cm), but the quality of vision may vary depending on the lighting. If necessary, it is recommended that a desk lamp be used for reading.