Caused by aging, most people experience presbyopia. It is an age-related problem which a person over 40 experiences, requiring the use of reading glasses. This condition is characterized by a sudden need to hold reading materials away in order to bring them into focus.
It also involves other symptoms such as headaches, fatigue, and eyestrain, especially when working on close crafts and other work that requires a closer look. A person with presbyopia may also need bright light in order to focus at night.
Presbyopia is commonly caused by a gradual thickening of the lens, which in response loses it flexibility within the eye. It usually occurs naturally during the aging process as proteins within the lens make them more rigid. Since the lens has become less flexible, it becomes harder for the eyes to focus. Thus, wholesale reading glasses are necessary.
Also known as farsightedness, hyperopia is the difficulty to focus on objects that are near. It is a common visual problem, and is often inherited. It is caused by the shortening or the eye ball or the slight curving of the cornea. When the eyeball is short, it focuses behind the retina and not on it when the light rays enter, causing nearby objects to appear blurry. A person with hyperopia needs to invest in good wholesale reading glasses if not wear corrective lenses all the time.
Eye diseases cause difficulty reading, which precipitates the need for wholesale reading glasses. Certain eye diseases can even increase the risk of developing presbyopia at an early age. Some of these eye diseases are diabetes and multiple sclerosis. There are also medications that affect the ability of the eye to focus, such as anti depressants and diuretics. Other possible caused of the need to wear reading glasses are eye tumours and lens dislocations.
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