Do not confuse eyeglass prescription with that of a contact lens prescription, as they are not the same. When it comes to eyeglass prescription, it is for the purchase of eyeglasses only. Whereas, a contact lens prescription contains certain information that can only be obtained during a contact lens consultation and fitting.
After an eye examination the doctor gives an eyeglass prescription which contains certain things related to the problem of the individual’s eye. The doctor also mentions the types of visual problems, such as being nearsighted, farsighted, or astigmatism.
The Terms Used in Eyeglass Prescription
There are abbreviations that a doctor mentions in the prescription after an eye examination. Some of the common terms mentioned are;
Oculus Uterque (OU), (OD) and (OS):
Oculus Uterque is Latin term for ‘both eyes’. This means that the visual problem resides in both the eyes. OD for the right eye, and OS for the left eye. These abbreviations are a way of avoiding confusions for the doctors.
Sphere (SPH)
It indicates the power of the lens, measured in diopters (D). It is prescribed to correct a person suffering from nearsightedness or farsightedness. The difference between, is determined by the negative or positive signs. Minus (-) before the number of the lens power suggest nearsighted, plus sign (+) indicate a farsighted prescription.
The Types of Eyeglass Lenses
Earlier, eyeglass lenses were available in only glass forms, but with the advance in technology there are many hi-tech plastics alternating the glass lenses. These modern eyeglass lenses are lighter, thinner, and more scratch-resistant than glass lenses.
Polycarbonate lenses
These lenses are impact-resistant and are an ideal choice for athletes and active people. Polycarbonate lenses also provide ultraviolet protection.
Trivex lenses
The characteristics of these lenses are similar to polycarbonate lens; however they are made from a new type of plastic. They are extremely lightweight, thin, and impact-resistant and give a clarity vision to the wearer.
High index plastic lenses
This type of lens has been basically designed for people who have really bad vision and require strong prescriptions. Unlike the usual thick lenses that are required in strong prescription glasses, these lenses are light and thin.
Aspheric lenses
These lenses are spherical in shape. They consist of differing degrees of curvature over its surface, and this makes the lens thinner and flatter than other lenses.
Photochromic lenses
The color of these lenses changes from clear to tint when exposed to sunlight. And it can be worn as a sunglass as well.
There are many reasons as to why choose Nearest Burnaby Optical Stores. One of the main reasons is because Midgate Optical Store is one of the oldest and most trusted running optical stores in the area.