Nearsighted Prescription Information

Posted in nearsighted | No Comments » January 2nd, 2012

 If things up close appear clear but not those that are at a distance, then you are probably nearsighted. Nearsightedness has a focus point up close and a blurred vision in the distance due to the light entering the focus of the eye in front of the retina. Therefore, objects at a distance are seen more clearly with the use of glasses, contact lenses and even surgery.

A nearsighted prescription contains a minus or negative sign before your prescription numbers. The higher the number is after the minus sign, then the bigger the vision correction that you need.

The lenses in your eye glasses or in your contact lenses will change the light and curve so the image will fall farther away or shorter than it currently does. It is important to understand your nearsighted prescription to give you a better idea on your vision needs. Whatever your nearsighted vision needs, it will be adjusted to fall on the retina instead of away from it. When this happens, the brain will interpret it and the blurriness will disappear. When you remove your glasses, things will appear blurry again because the glasses do not change the shape of your eye but instead changes the way an image is reflected.

Understand your Nearsighted Prescription

Posted in nearsighted | No Comments » December 19th, 2011

 When you check out your nearsighted prescription, you will notice numbers listed under headings OS and OD. These are Latin abbreviations. OS or oculus sinister means your left eye and OD or oculus dextrus means the right eye. On occasion, you will see an OU notification, meaning something that involves both the eyes.

A minus sign means you are nearsighted and these numbers represent diopters. If your prescription reads -1.00, this means you have a diopter of nearsightedness. If it is -4.25, this means you have four and ¼ diopters and requires thicker or stronger lenses. A lot of people think that a +1.75 is required when buying over-the-counter reading glasses. However, it takes a bit of algebra to figure out the total power needed for single vision reading eyeglasses.

More abbreviations you have to know in order to understand your nearsighted prescription better includes SVD, SVN, and Sphere, Cylinder, PD, axis and prism. SVD means single vision distance or glasses that are for distance use only; SVN is single vision near or for reading only. Sphere is spherical power that has the same power in all meridians, cylinder power that corrects astigmatism and represents the difference in the greatest eye power and the weakest eye power, normally separated by 90 degrees. Axis indicates an angle between the two meridians of astigmatism, PD is the measurement vital in designing glasses that are comfortable to wear and optically good. Prism is often prescribed to displace an image in a certain direction for those with cross-eyes or other eye muscle disorders.

Understanding Nearsighted Prescription

Posted in nearsighted | 1 Comment » December 6th, 2011

 Common refractive disorders of the eye like myopia or nearsightedness are measures in units known as diopters. In a nearsighted prescription or other eye ailment, the diopters represent the amount of correction that one needs in order to normalize the vision. The more nearsighted you are, the higher your diopters prescription is.

The prescription is composed of three numbers namely, -5.00 x 180 which represents a typical prescription. The first -5.00 number identifies the degree of your nearsightedness or farsightedness. Moreover, -sign signifies that you are nearsighted. The second number -1.50 describes your degree of astigmatism and the number could be written with either a +sign or a – sign.

The third number 180 describes the axis that indicates the astigmatism direction. For instance, a 180 degree axis means the astigmatism is horizontal. A prescription of -5.00 – 1.50 x 180 indicates that one is moderately nearsighted and with a moderate astigmatism degree in a horizontal direction. Nearsighted prescription includes wearing eyeglasses and contact lenses. Glasses are suitable for people, young and old alike. Nearsighted prescription glasses have lenses that re custom made for every eye prescription and suit individual needs. Eye doctors measure the strength of every eye and you get your eyeglass prescription.

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