Presbyopia can be defined as a vision disorder which accompanies old age, causing loss of reading and near vision. It impacts the ability of a person to focus closely, an issue related to the phenomenon of eye refraction. Presbyopia is quite a common visual problem and may start to develop gradually after the age of 40 years.
Causes Of Presbyopia
Let’s try and understand the cause of Presbyopia and the reason why it develops in such a large section of the population. There is a clear lens that is naturally placed behind the iris of your eye. This lens is responsible for changing shape so that light can be focused onto the eye retina to facilitate vision function. At a younger age, this lens has more flexibility and can easily change shape. Hence, you can focus on both close and distant objects without any problem. But after crossing the age of 40, your eye lens tends to become slightly rigid. This means that it is harder for it to change shape and reflect light. Hence you encounter difficulties in performing all kinds of close-up tasks like reading or threading a needle. You cannot reverse or prevent the natural aging process responsible for the onset of Presbyopia.
While eyeglasses have traditionally been prescribed as the most effective solution for Presbyopia, patients don’t usually like the idea of constantly having to deal with glasses (taking them off and putting them back on).
Today, there are a range of advanced lens solutions available for Presbyopia. In fact, patients have the option to select a specific variety of lens which can be implanted during the cataract surgery. Accommodating intra-ocular lenses (IOLs) have slowly taken over the traditional IOLs n (single- vision) and are designed for helping patients to see objects at multiple distances with differential focal points.
The aim of accommodating IOLs is to offer clear functional vision to the individual (for a range of different distances) and reduce the need for glasses.
Crystalens Accommodating IOLs work to mimic the movement of your young natural eye lens and can therefore change shape/or move in a way that allows the eye to focus at varying distances. Currently, Trulign Toric and Crystalens are the only accommodating IOLs approved by the FDA. Both IOLs are mechanical and their implantation takes place inside the eye. For this, the surgeon makes appropriate calculations during the initial consultation and selects the right implant power before the surgery.