Q: What options are available in terms of glasses and features? It is very important for all patients to have their best spectacle correction to reduce strain during day to day activities. At the risk of oversimplifying, there are three main types of lenses: single vision, bifocal, and progressives. Single vision lenses have only one prescription in them and are intended to be used for one specific purpose (usually for distance, reading, or computer) in patients over 40 due to presbyopia, the inability of the eyes to focus. However, most patients under 40 can use single vision lenses for all purposes. The majority of patients over 40 do best with progressive lenses, which is the type of lens usually recommended by doctors to help with presbyopia. Progressive lenses have a top area for distance viewing and then gradually shift to the near prescription for reading. In between, they contain a prescription for computer usage as well. Their convenience and versatility is their main advantage, but they are not for everyone. Since the transition between distance and near prescriptions is gradual, they take some practice to figure out the correct area of the glasses that need to be looked at for the specific visual task and are not recommended for patients with moderate to advanced glaucoma, brain trauma, or strokes due to the distortions and limited fields of vision this gradual transition can cause. The other option is a traditional bifocal which has a single vision lens typically for distance and a smaller section separated by a visible line for reading. These are useful if patients are more or less stationary the whole day and can tolerate having a visible line on the glasses. They are not very versatile otherwise but do allow for greater fields of vision for reading and distance. In terms of add-on features, there is an even wider range of options. Lens made with Crizal are always recommended due to the material featuring extremely effective anti-glare and anti-reflective properties without the resorting to a temporary anti-reflective coat that can easily wear off and cause an unsightly mottled appearance to the glasses. Transitions brand lenses are recommended for patients with light sensitivity and those requiring eye protection from UVA and UVB lights due to the lens becoming darker depending on the brightness of the light. Unfortunately, the older version does not seem to be activated in cars making them not useful for driving but there are upgraded versions of Transition lenses that do change in cars. Other features are available for glasses and may be strongly recommended by the doctor depending on the prescription or needs. For more information, please visit our website, advancedeyecareny
Posted on: Tue, 18 Jun 2013 20:36:01 +0000
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