A Guide to Choosing the Best Prescription Eyeglasses
A prescription for eyeglasses might come after an eye exam with your optometrist or ophthalmologist. They may tell you that you are nearsighted, farsighted, or astigmatism.
(firmenpresse) - A prescription for eyeglasses might come after an eye exam with your optometrist or ophthalmologist. They may tell you that you are nearsighted, farsighted, or astigmatism. But what does all of that mean? What is the difference between prescription eyeglasses and contact lenses? You will find this article helpful in navigating the world of prescription eyeglasses and contact lenses and helping you make the right choice.
Nearsightedness (myopia) is a common cause of blurred vision. It is characterized by blurred vision when looking at distant objects. It may be mild, moderate, or severe. Nearsighted people have trouble seeing things that are far away, but are able to read newspaper print well. A blackboard, movie screen, or television may, for example, give you difficulty seeing words or images clearly. It can affect the performance of a person in school, athletics, or at work. Contrary to this, farsighted people are better at seeing things at a distance than up close. If you are very farsighted, close objects may be too blurry to read or stitch. Astigmatism is common with these vision disorders as well. If properly prescribed eyeglasses or contact lenses are used to correct “normal” astigmatism, almost all degrees of it can be corrected.
If you look at your prescription for eyeglasses, you will see numbers listed under the headings of OD and OS. These numbers will help you determine what type of eyeglasses or lenses you need.
A right eye is abbreviated as oculus dexter and a left eye is abbreviated as oculus sinister. In order to write prescriptions, eye doctors see your right eye on your left (first) and your left eye on your right (second) when facing you. A lens power sphere (SPH) indicates whether a person is nearsighted or farsighted. The farther away from zero your prescription number is, the worse your eyesight and the more correction you will need. You're farsighted if there's a plus sign in front of your eyeglasses, and you're nearsighted if there's a minus sign. The numbers represent diopters, the unit used to measure how much correction your eye needs. For people who suffer from astigmatism, the prescription will contain three numbers. Generally, these numbers are written as S x C x Axis. The C refers to the "cylinder" or astigmatism, and can be either a positive or negative number. The bigger the C, the greater the astigmatism.
This is the meridian of the lens that does not contain any cylinder power to correct astigmatism. The number 90 corresponds to the vertical meridian of the eye, and the number 180 corresponds to the horizontal meridian.
Prescriptions for glasses are made up of two main components: shape and power. The type of correction is determined by the shape of the lens. Concave lenses correct nearsightedness by making the sides thicker than the middle. For farsightedness or presbyopia, convex lenses are thicker in the middle than at the sides. To compensate for irregularities in the cornea that cause astigmatism, cylindrical (toric) lenses are curved more in one direction. When a person with presbyopia loses their ability to focus on close objects around the age of 40, convex lenses or bifocals refocus the image on the retina. In addition, the power of a lens determines the amount of correction. It is specified in diopters. The higher the diopters, the higher the degree of correction. Ask your eye doctor about other lens enhancements, such as:
Photochromatic lenses, which darken in situations where sunglasses would otherwise be worn and act as "normal" eyeglasses in regular daylight.
Plastic lenses should be protected from scratches.
Tints are usually cosmetic, but they can also be helpful to those with sensitive eyes.
More than 11 percent of kids under the age of 10 wear prescription glasses. For teens, those numbers are much higher. Glasses aren't just a means to an end, they're a part of who you are. The frame styles vary with fashion, and can be made of plastic, plain metal, plastic and metal, or “speciality” metals such as titanium and carbon graphite, which are both highly resistant to damage.
Your new eyeglasses should feel almost as if you aren't wearing them, despite how fashionable some eyeglasses may be! When you play sports, your everyday eyeglasses should not rub against your ears or nose, fall off easily, or otherwise feel uncomfortable. Contact lenses and safety eyewear used in industry do not meet the same high safety standards as sports eyewear. Make sure you get the advice of your eye doctor when it comes to sports eye protection.
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Datum: 01.08.2024 - 09:32 Uhr
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