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How to Read Eyeglass Prescriptions
According to the US laws, patients are entitled to get the prescriptions of their eyes after
paying for the eye examinations. With such a valid and updated prescription, eyewear
customers can resort to any other resources for prescription eyeglasses. They are no longer
limited to buy corrective spectacles from eye care practitioners. Without seeing an eyeglass
prescription, some people may wonder what kinds of information are described. But another
problem is that many people can not understand items listed in a prescription. In order to
know details of personal visual condition, it is really important to learn how to read eyeglass
prescriptions. In general, an eyeglass prescription is closely associated with refractive
errors. In other words, different eyeglass prescriptions are used to describe respective
visual problems or visual conditions of individuals. Being able to interpret eyeglass
prescriptions is a useful skill.
In fact, eyeglass prescriptions written by eye doctors worldwide come in a standardized
format with standard notation. There are some basic symbols and numbers on each of
eyeglass prescriptions. In most cases, there are two items in a prescription, each of which
describes one of the two eyes. It is necessary to give a lesson in Latin in advance. The
letters OD stands for "oculus dexter", which means the right eye in English. And the letters
OS represents "oculus sinister", corresponding to the left eye. There is also OU which is
short for "oculi uterque" and means the both eyes. Now, it is the time to give an example of
the item for the right eye, like OD: -2.00 -0.5 X 180. The first number is actually the
"sphere" part of the prescription, which indicates nearsightedness or farsightedness.
Remember that a minus sign represents a negative powered lens used to correct
nearsightedness. And a positive sign means the patient needs positive powered lenses to
correct farsightedness. What's more, the further away from zero this number, the worse the
patient's eyesight. For instance, -3.0 indicate a higher degree of nearsightedness than -2.0.
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