What are multifocal and accommodating lenses
This estimate is further supported by data from the Framingham Eye Study showing that the prevalence of cataracts increased with age from 4 percent in the 52 to 64 age group, to 50 percent in the 65 to 74 age group, to more than 90 percent in the 75 to 85 age group.
Before making the commitment to surgery, patients requesting these IOLs based on marketing perceptions or what they have read on the Internet must be made aware of the sacrifice they might experience with the night glare and loss of contrast, which they could perceive as reduced distance quality.
But second-eye surgery should be avoided until dissatisfaction with the first IOL is addressed.
Also, caution is recommended when it comes to mixing IOL technologies.
The diffractive portion of the optic consists of 12 concentric rings on the anterior surface of the optic, and it is located within the central circle, which is 3.6 mm in diameter and is designed to provide distance and near vision in moderate to bright light.
Apodization is the radial variation in optical properties that comes from decreasing the height of each concentric ring from the center toward the periphery of the optic surface (from 1.3 to 0.2 µm).
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Traditional strategies for these patients have included the following: The newer IOLs that actively accommodate by changing optic position or shape through attempted preservation of ciliary body function have received mixed reviews with regard to the predictability of accommodative range and the longevity of effect; however, the principles involved offer the best opportunity for us to eventually establish a mechanism and outcome that most closely rivals the vision found in youthful emmetropes.