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Prescription Glasses

Prescription Glasses and Understanding Your Prescription

Prescription Glasses

Many people need prescription glasses of some sort whether they are farsighted, nearsighted or have an astigmatism. When you go to the optometrist, which you should do every year or two, you will undergo a series of tests to assess your vision. Also, if you are at risk for eye problems, like glaucoma, you should make sure to see your eye doctor more often.

Some tests will have nothing to do with your eyeglasses prescription, such as measuring the pressure in your eyes. This helps determine if you have glaucoma. However, it is the refraction  that determines your prescription. With this test, you look at a chart with letters and numbers on it that is twenty feet away from you. Since most doctors’ offices do not have the space to put the chart twenty feet away from you, they will often use mirrors to simulate the distance.

You will look through a device called a phoropter, which has a number of different lenses. You generally start with just one eye, and the doctor will change the lenses until you can see the 20/20 line. Then you will look at the chart with both eyes just to make sure that you can see everything well.

The Sphere is a number that refers to what prescription strength is needed for you to focus properly. If it’s a negative number then you are nearsighted, while a positive number means that you are farsighted. These numbers generally range from +/- 0.00 up to around +/- 20.00. The numbers will increase in increments of .25. For example, your right eye could be -3.00 and your left eye could be -2.75, if you are nearsighted.

If you have an astigmatism, you will have a Cylinder number, and this number generally ranges from zero to +/- 4.00. This number also changes in increments of .25. The Axis number will tell you where your astigmatism is located on the eye. This number will range from zero to 180.

A Prism number will indicate that you have a lazy eye, and that your glasses will be designed to help remedy that problem. The Pupillary Distance or PD is the distance between your pupils, which helps make sure that the optical center of each lens is in the correct place. The Add number, usually +.50 to +3.50, will be present if you have a reading addition. This means your glasses can be used for reading or up-close work.

Though the numbers might sound a little complicated at first, Drs. Drake always take the time to explain your prescription to you. If you think you need prescription glasses, give us a call to schedule an appointment to determine what is right for you.

Broomfield Optometrist – Hours

3D Vision
Broomfield Optometrist
5760 W. 120th Ave.
Suite 240
Broomfield, CO 80020
Monday: Closed
Tuesday: 1pm – 5pm
Wednesday: 10am – 7pm
Thursday: 8am – 5pm
Friday: 10am – 7pm
Saturday: 9am – 5pm
Sunday: Closed

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Patients’ Choice Award

Top optometry clinics in Broomfield, CO 2015
Congratulations to 3D Vision for winning the 2015 Patients' Choice Awards in Broomfield Optometry
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