To choose whether non prescription glasses are bad for your health, first you have to think about which definition of "non prescription glasses" you're using. This specific term is employed in two unique ways. It may mean "imitation" or style eyeglasses, which don't have corrective lenses; they're much like normal shades, but they aren't shaded. The next definition of "non prescription glasses" means they're vision-correcting eyeglasses which were obtained with no prescription.
If you're using the first definition, and wish to go searching for fashion eyeglasses which don't have any corrective attributes, then you are going to be perfectly nice, as they won't hurt your eyes in any respect. After all, people have worn sunglasses for several years without ill effects, and of course sunglasses can also protect the eyes from harmful ultraviolet rays, based on which ones you purchase. The most important danger for folks that wear non prescription fashion glasses appears when vanity overrides sanity. It's ill-advised to drive at night or in dull conditions wearing dark sunglasses, and though there isn't any danger to your eyesight from wearing the glasses, you're at higher risk of having an accident due to decreased visibility.
Just a small care has to be taken if you will wear the corrective sort of non prescription glasses. In the event the incorrect strength of lenses is selected, the end result can be eyestrain and associated headaches, and over a time period this can lead to damage to the eyes.
However, it's still important to visit a respectable shop, like a pharmacy, where you'll have the ability to try out a vast choice of glasses of differing strengths. After you've discovered the optimal strength of lenses, you'll have the ability to pick out a pair in a style of your choice.
For people younger than 40 years old, and particularly in instances where blurred vision develops rapidly, or is accompanied by other symptoms such as headaches, it's crucially important to find an optician or optometrist in the first case. Eye specialists are trained to spot these problems - though in the huge majority of instances, the origin of the vision defect will be normal and benign.
A number of the potential health conditions which were noted to affect vision include diabetes, where rapidly changing blood glucose levels can impact the number of fluid in the eyes, causing swelling which leads to distortion of vision. Another, potentially fatal, condition is extreme hypertension which may result in heart attacks and strokes. This kind of underlying problem might be spotted by an optometrist since it can result in swelling of the optic disk.
If you're healthy and are positive that you don't have any underlying health conditions, they'll be perfectly fine. However, all cases where there's a sudden change in your eyesight ought to be investigated by means of an expert to rule out anything more serious than a vision defect. Generally speaking, as soon as you've been prescribed your very first pair of corrective glasses, usually fairly early in life for shortsightedness, it's encouraged that you find an optician for a retest every couple of decades. If you're over 40 years old, however, and your sight has slowly deteriorated during a lengthy period, then non prescription glasses will be OK, even though there isn't any reason to prevent seeing a specialist if you're worried about any other accompanying symptoms.
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