Non Prescription Glasses

 

The first time most of us come into contact with eyeglasses is either because we started getting headaches at college and went to see an optician; or simply because we wanted to look cool on vacation, and bought our first pair of decent sunglasses. If you have great eyesight, and do not need corrective lenses, then you may already be aware that your sunglasses fit into the category called non prescription glasses. However, when searching online or in the stores for non prescription glasses, you need to realise that there are two, almost opposing, definitions. They are explained in the remainder of this article.

It is fairly common that when a person gets old, it becomes difficult for him/her to read. This acuity-oriented problem is in direct association with the aging muscles in the eye. As a result, those things that are near to us become quite difficult to scrutinize. This can be observed especially in the case of avid readers who have to go through text all the time. Moreover, if you wear reading glasses with prescription all the time, it can be a cause of concern, as you will need to shift focus from one part of the lens to another on a frequent basis. The best way of dealing with it is to use non-prescription glasses that come with a certain degree of power. Such glasses help in magnifying letters and words that may seem minute to the naked eye. This way, one can also rectify problems with bifocal reading.

If you are using the first definition, and want to go shopping for fashion glasses that have no corrective properties, then you will be perfectly fine, as they will not damage your eyes at all. After all, people have worn sunglasses for many years without ill effects, and of course sunglasses may also protect your eyes from damaging ultraviolet rays, depending on which ones you buy. The main danger for people who wear non prescription fashion glasses appears when vanity overrides sanity. It is ill-advised to drive at night or in dull conditions wearing dark sunglasses, and although there is no danger to your eyesight from wearing the glasses, you are at increased risk of having an accident due to decreased visibility.

There is a second meaning of the phrase "non prescription glasses" however. In this alternative case, they do have correcting lenses just like a standard prescription pair you might buy from your optician. These glasses are available from all sorts of outlets such as pharmacists, and are sometimes called over-the-counter (or OTC) glasses. They are usually for people over the age of forty, who suffer from presbyopia - the normal deterioration in eyesight due to aging.

Some of the possible health conditions that have been noted to affect vision include diabetes, where rapidly changing blood sugar levels can affect the quantity of fluid in the eyes, causing swelling which results in distortion of vision. Another, potentially fatal, condition is extreme hypertension which can lead to heart attacks and strokes. Such an underlying problem may be spotted by an optometrist because it can lead to swelling of the optic disk. Even brain tumors have been identified by eye specialists during examinations for the cause of blurred or double vision.