Presbyopia is an unavoidable vision problem that bothers people above 40. Some eye doctors think that presbyopia is caused by the stiffening of the lens, while others suspect lens’ continued growth or related muscle atrophy.

A posterior capsule opacity (PCO) is the most common among those few cataract surgery complications, including eye inflammation, infections and a dislocated IOL. The reason for a PCO comes from the lens capsule, which will be maintained during a surgery. About 20% of patients have haziness on their intact posterior capsules, so that even if the lens has been replaced with a successful IOL, the vision is still blurry. A PCO is not a “secondary cataract”. Cataracts will never recur once removed.

Most cataract surgeons can deal with common types of cataracts, such as removing clouded lens and replacing a standard IOL. What the patient should pay attention to are the types of IOLs and their costs.

Artificial intraocular lenses (IOL) was firstly approved by FDA in 1981, before which patients had to wear thick eyeglasses or particular contact lenses in order to offset the focus distortion brought by cataracts removal. But now, most surgeons are concerning about the surgical technique and lenses design of the various IOLs, such as premium IOL, toric IOL and so on. Both the patients and doctors are more careful about the functions of different types IOLs.