Cataracts usually form slowly. You may not know you have them until they start to block light. Then you might notice:
Doctors don’t know exactly what causes cataracts, so there’s no proven way to prevent them. But since cataracts and other conditions, such as glaucoma, are common in older adults, it’s important to get your eyes checked regularly. This is really important if you have a family history of eye problems or have been exposed to things that could cause trouble with your eyes.
Adults should see an eye doctor at least every 2 years until age 50, and then every year after that.
In cataract surgery the natural lens of the eye is removed. This leads a significant decrease in the optical convergence power of the eye or hypermetropia. Intraocular lenses are small lenses made of polymers and implanted into the eye in place of natural lens to help focus the light on to retina. When it comes to intraocular lenses (IOLs) for cataract surgery, there are number of different types of materials that eye surgeons can select from.
Foldable lenses are made of two types of material – hydrophilic and hydrophobic acrylic – the latter being better in terms of long term results and least possibility of posterior capsule opacity. Both hydrophilic and hydrophobic lenses incorporate UV filters, but hydrophilic IOLs are constructed from aliphatic materials: the UV filter is less efficient when compared with aromatic-based hydrophobic materials.
Lens Material - Silicone, Hydrophilic & Hydrophobic Acrylic :
The optical design of the intraocular lenses are :