Precise Vision Correction In North Carolina

Whether you choose eyewear or contacts, the frames style and or brand of contacts is important, but first and foremost is a precise prescription for clear, quality, corrective vision.

Today’s consumer is surrounded by a multitude of offers for eyewear and contacts, but ensuring the lens design is right for your eyes is essential. This is a major difference in the level of service provided by your Vision Source eye doctor versus other providers. Understanding the vision life cycle, patient age, budget and facial characteristics, are all factors considered by the staff and doctors at your Vision Source practice.

While the goal is to provide vision correction that allows for 20/20 visual performance, keep in mind that 20/20 vision does not necessarily indicate perfect vision. Rather 20/20 only indicates the sharpness and clarity of vision at what normally should be seen at a distance of 20 feet. Your Vision Source eye doctors consider all aspects of visual correction and, in many cases, our goal is to have your visual clarity exceed 20/20.

Understanding Your Eye Prescription

Let’s say your eye doctor just informed you that you are either nearsighted, farsighted or have astigmatism. What do all those numbers on the prescription mean? There are three elements of an eye care prescription:[/vc_column_text]

  • “OD” or the oculus dexter, Latin for right eye
  • “OS” or the oculus sinister, Latin for left eye
  • “OU” or the oculus uterque, Latin for both eyes.

Each eye is then measured based on the following elements:


Prescribed to correct nearsightedness or farsightedness, indicates the amount of lens power, measured in Unit of measure for the refractive (light-bending) power of a lens; eye care practitioners use it in eyeglass and contact lens prescriptions. A negative number refers to nearsightedness; a positive number, farsightedness. For example, someone with -8.00 diopter lenses is very nearsighted, while someone with +0.75 diopter lenses is only slightly farsighted.” >diopters (D). A (-) minus sign indicates nearsighted and a (+) plus sign indicates farsightedness and when showing up under sphere means the correction necessary is spherical.


This specifically indicates lens correction necessary for astigmatism. If you do not have astigmatism, you may see this as blank on a prescription. Cylinder correction is separate from spherical correction, and like sphere, a minus sign is for the correction of nearsighted astigmatism or a plus sign for farsighted astigmatism. Cylinder power always follows sphere power in an eyeglass prescription.


If an eyeglass prescription includes cylinder power, it must include an axis value. This is defined with a number value of 1 to 180 to indicate correction along the horizontal and vertical visual fields.

Prism & Base

Few corrective vision prescriptions include prism. When they do appear, they will be indicated in decimal form, such as .05 and used to compensate for eye alignment problems. The base refers to the thickest edge of the prism where the lens redirects light, “up” or “down”.


When presbyopia exists, a condition of the eye’s inability to adjust focus from near to distant (prevalent in patients over 40), “add” represents the magnifying power added to the bottom part of multifocal lenses. This number is always a (+) plus power ranging from +0.75 to +3.00 diopters and, in most cases, the same for both eyes.

Know Your Lenses for Better Vision

Over 80% of time spent obtaining a new pair of eyeglasses is spent on selecting frames, when the most important part of your eyeglass purchase is the lenses. Fashion is important but remember, you “see” through your lenses, not your frames.

  • Many advertised offers for “low price” prescription eyewear possess old technology and have little or no UV protection (SPF sun protection factor).
  • Many low price offers do not include scratch resistant or anti-reflective (AR) coatings.
  • Low price offers can limit your frame selection to a few styles or brands
  • Lens quality makes a significant difference with vision clarity.

The life of the lens, level of daily activity and eye health must be considered when deciding on the level of lens investment