Cataract Types
Types of CataractsTypes of cataracts generally fall into these 4 categories. 1. Age Related Cataracts
An age related cataract is the most common of all the types of cataracts. In fact over 50 % of those over the age of 80 in the U.S. will have a cataract in one or both eyes. These cataract types are based on where they form on the lens. The three types are:A. Nuclear Cataract The nucleus of the lens is at the center. When a cataract forms in the center of the lens it is a nuclear cataract. B. Subcapsular Cataract When a cataract forms in the membrane that surrounds the lens, the capsule, it is a subcapsular cataract. C. Cortical Cataract This cataract forms on the outer edge of the lens, called the cortex, and as it grows, it goes toward the center. Each of these types of cataracts affects vision in a different way. A patient may have more than one type of cataract at the same time. 2. Congenital Cataracts
A congenital cataract means it was there at birth. They don't always cause a vision problem. Most of the time a congenital cataract is from an undetermined cause, but sometimes it is just one of many symptoms that are associated with a syndrome.It is important that the vision of the child be assessed to see if treatment is needed. When an infant experiences a severe loss of vision their development in many other areas can be delayed and greatly affected. 3. Traumatic Cataracts
Traumatic cataracts occur after there has been some type of trauma to the eye. It can result from a blunt force, a foreign object, radiation, chemicals or an electrical current. The cataract may form right away or not for years.
4. Secondary CataractA secondary cataract forms after some other type of eye surgery, or as a result of another health condition, like diabetes.Some patients will develop a secondary cataract after their initial cataract surgery. This happens when the capsule that holds the artificial lens in place becomes cloudy. It can happen weeks or years later after the cataract surgery. The symptoms are like that of other cataract types - clear vision becomes cloudy, hazy or blurry. The standard treatment is a type of laser surgery.
Some medications like steroids are associated with cataracts.
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