Hot Reading Glasses Styles
Tuesday, November 11th, 2008What is sphere power?
This is the main part of your prescription. This number denotes the strength of the lens as measured in diopters.If you have good distance vision without glasses, but need reading correction only, laser refractive surgery is not an option for you.
What are my options for the reading glasses at NeoVision?
You can order your own custom reading glasses by choosing any of our eye glass frames and adding reading lenses in your unique prescription. You will be able to order glasses with clear prescription lenses or with tinted prescription sunglass lenses with anti-scratch, anti-UV, and / or anti-reflective coating. You will also have a choice of lens materials such as CR-39 plastic, polycarbonate, Trivex, or hi-index.Light rays passing through the optical center (OC) of a lens are not refracted. With proper PD measurements, your eyes are centered at the optical center of the lens. For taking your unique fitting measurements, your physical presence is absolutely necessary. We will need to pre-adjust the frame on your face before ordering your glasses.
Can you raise segment height by adjusting the frame on my face?
Yes, the seg height can be raised either by bringing the nose pads together or by adding a pantoscopic tilt.Lenses with anti-reflective coating.
Why do children need sunglasses?
Children are at a higher risk from the harmful effects of UV since they generally spend more time outside in the sun. Select sunglasses that suit your child’s active lifestyle. The lenses should be impact resistant i.e. made of polycarbonate.Your eyeglass prescription contains information regarding the lens power required to correct your vision problems. It consists of spherical power, cylindrical power, cylinder axis, bifocal addition, and prism power. Your prescription will contain only those numbers that are pertinent for your vision correction, for example if you do not have astigmatism, you would not have a cylindrical power and axis information in your prescription. Most prescriptions do not contain prism power.Light rays passing through the optical center (OC) of a lens are not refracted.
What is cylindrical power?
If there is no value under the cylinder heading, then you have a simple prescription. If there is a value under this heading, then you have astigmatism. Like sphere power, the cylinder power is also measured in diopters.Anisometropia is a condition where there is a significant difference in the refractive errors of the two eyes. If this condition is present in infancy and is undetected or untreated, it often results in the development of lazy eye or amblyopia in the weaker eye. The greater the amount of the difference, the more likely the development of lazy eye will be. A problem can occur when glasses are made for an anisometropic individual.
What is a diopter?
A diopter is a unit of measurement that is simply the inverse of the focal distance of the lens as measured in meters. For example, if a lens has strength of 2 diopters, then parallel light rays that pass through this lens will focus together at a distance of 1/2 meter (50 cm) away from the lens.Frames are identified by manufacturer / designer, model number or name, size, and color information. Size information contains the horizontal measurement of each lens in millimeters (i.e. 47) and bridge size (the distance between the lenses) i.e. 18. This information can help you in sizing a frame for your face.