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Eyeglasses of all types can be divided into two groups according to the function of their lenses. One main group is prescription eyeglasses, which are equipped with lenses with a power or certain powers. The other basic group is non-prescription eyeglasses. It is absolutely true that there are many ways to categorize the numerous spectacles produced by different manufacturers in the world. But lens power is one of the simplest approaches to such a classification. Eyeglasses in old days were all prescription ones because those wearers resorted to these devices solely for vision correction. Non-prescription eyeglasses are now available and popular in modern days. The emergence of non-prescription spectacles suggests that there are urgent needs from certain individuals to decorate their eyes. This is best testified by the prevalence of fashionable sunglasses. While non-prescription glasses are being enjoyed by more and more people who never need vision correction, prescription eyeglasses are still indispensible for those with defected eyesight.
In general, eyeglass users can buy a pair of prescription eyeglasses only when he or she has gained a valid prescription of the eyes. Such kind of eyeglass prescriptions can be determined by an eye doctor, either an optometrist or an ophthalmologist. An eye optician only has the right to provide eyeglasses according to a prescription given by an eye doctor. This is a strict requirement which is aimed to ensure eye safety for those wearers. In a serious case, an improper or out-of-date prescription may impair the wearer’s eyes. Prescription eyeglasses will help the eyes refocus the entering eyes appropriately, which is called “correction” in brief. But a basis point is that such kind of correction can be precise only when the eyeglass lenses have the right power according to the wearer’s eye condition. In a traditional way, most people trust eye doctors or practitioners when they want to buy prescription eyeglasses due to security concerns. In fact, other sources especially online eyewear stores can also provide safe prescription glasses. They can offer spectacles with vision correction exactly according to the prescriptions submitted by customers.
Dissimilar to prescription eyeglasses, non-prescription spectacles are designed to meet the needs for fashion. Many ordinary individuals and celebrities choose to wear designer sunglasses in summer days. Modern types of non-prescription eyeglasses usually incorporate the cut-edge fashionable tastes. Semi-frame and frameless eyeglasses are both stylish. In addition to special frame styles, non-prescription eyeglasses can also take use of unusual colored lenses. In some cases, those slightly tinted lenses can create an attractive effect. In a word, stylish elements are the key contributor to non-prescription glasses.
Firmoo.com is the emerging online optical store selling high quality eyewear, such as prescription eyeglasses (single vision myopic glasses, reading glasses, bifocal and progressive eyeglasses etc.,), prescription sunglasses (with RX tinted lenses), prescription sports goggles. Firmoo guarantees lowest possible price in the market. Firmoo’s return and refund policy makes any purchase risk-free ones.
Your insomnia comes and goes? You need at least 5 hours of sleep? You want something fast that you can get without a prescription. Besides, you really donâ??t want to mess with those presumably â??heavy dutyâ? prescription sleeping medications. So here are the fast facts about non prescription sleep aids to guide you.
Usually, non prescription sleep aids generally refer to 2 types of sleep aids. They are the antihistamines and the dietary supplements.
Antihistamines:
1. How do they work? The ones used as non prescription sleep aids have been around for awhile, probably since you were a kid. These are the very drugs you take when you have cough and cold or allergies.
These antihistamines are very popular not just because they are effective for your cough and allergies. You recover faster because the â??benefitâ? of their side effect of prolonged drowsiness â??forcesâ? your body to rest and recover. In the same way, you are basically using the drowsiness side effect to get you to sleep
2. What are they? Antihistamines used as non prescription sleep aids consist of 2 types of active ingredients i.e. diphenhydramine and doxylamine
3. Popular brands are:
Sominex, Nytol, Tylenol PM, Benadryl (Diphenhydramine compound) Unisom, Equate (Doxylamine compound)
4. Side effects that are common:
Prolonged drowsiness or hangover effect that impairs driving, etc Dizziness Fatigue Headaches Reduced alertness Vomiting
Racing heartbeat and constipation are also becoming frequent complaints in this group of non prescription sleep aids.
5. Who Canâ??t Use Them
However, there are certain groups of people who cannot use the antihistamines as a non prescription sleep aid. As with any medication, they are not for pregnant or nursing women due to unknown risk of drug transfer to the fetus and young infant on motherâ??s milk.
You are advised against taking diphenhydramine (Sominex, Nytol) if you have:
Heart problems Glaucoma Enlarged prostate
Especially for Unisom, you canâ??t even take them if youâ??ve got asthma or bronchitis.
6. Other precautions when you take the antihistamines.
Avoid alcohol. It increases the sedative effects of the pills. Even a small amount of alcohol combined with sleep aids can make you feel dizzy, confused or faint.
Never mix with a sleeping pill, sedative, tranquilizer, or another antihistamine. This could lead to dangerous drug-drug interaction outcomes.
Dietary Supplements:
2 of the most popular dietary supplements used as non prescription sleep aids are melatonin and valerian. This is followed by chamomile, a much milder non prescription sleep aid, that is frequently combined with other herbs as supplements in capsules.
Melatonin
Itâ??s a hormone secreted from the pineal gland in our brain. It regulates our bodiesâ?? internal clock or circadian rhythm i.e when it’s time to go to sleep and when it’s time to wake up. Melatonin has created much interest among researchers; you will find over 14,000 studies on this hormone compared to valerian with 556 studies, according to the National Institute of Health (NIH) database.
Melatonin is probably the most widely prescribed among herbal non prescription sleep aids. Even 15% of pediatricians who prescribe sleep aids for children with insomnia recommend melatonin, according to the medical journal Pediatrics (2002).
Its synthetic form is available in many brands; AVOID natural forms that are basically melatonin derived from animalâ??s pineal glands due to possible contamination Side effects that are common are daytime drowsiness headaches, dizziness, a “heavy-head” feeling, stomach discomfort It may interact with common drugs
Valerian
Itâ??s a plant; its active ingredient is still unclear therefore how it works is unclear too. Valerian appears to increase the body’s available supply of the neurotransmitter gamma aminobutyric acid (GABA). Itâ??s generally thought to help reduce the time to get to sleep.
Valerian is less effective than prescription sleep medication. One possible advantage of valerian, however, is that it does not seem to cause as much of a “hangover” effect the next day. Also, people taking sleeping pills sometimes have a temporary worsening of insomnia when they are discontinued (rebound insomnia), an effect that hasn’t been reported with valerian.
Available in many brands but hard to compare as the potencies of various ingredients vary from preparation to preparation. Generally safe when taken in recommended dosages. However, high doses of valerian can cause nausea, headaches, dizziness, vivid dreams, weakened heartbeat and even paralysis. Not to be used by pregnant or nursing women like any other non prescription sleep aid It may strongly react with other prescription on non prescription sleep aids, alcohol, and other medications
Chamomile
Itâ??s one of natureâ??s oldest herbal sleep aid used for centuries. It is best known as one of the gentlest non prescription sleep aids around. The active ingredients are flavonoids namely, chrysin and apigenin, believed to reduce restlessness helping one feel more relaxed and more prepared to sleep.
It also has anti-inflammatory and anti-bacterial properties. Thatâ??s why itâ??s also popularly used in cases of stomach irritation.
Known as a â??plant doctorâ?? stimulating the health of other plants, you will find it in countless brands as it is popularly combined with other herbs to make standardized herbal remedies. It does not lead to dependency and has not been shown to have any side effects. However, it may cause allergic reactions in people who have plant or pollen allergies. Avoid using with other prescription on non prescription sleep aids, alcohol and medication as it may increase their effects
Find out other options like Natural Non Prescription Sleep Aids with the Fast Guide To 5 Popular Natural OTC Sleep Aids. This guide is provided by OTC-Sleep-Aids.com
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