An eye doctor will examine an individuals eyes to determine any vision problems or refractive errors. One aspect that eye doctors will consider is the eye axis. The axis is the lens meridian that does not contain cylinder power, defined by a number between 1 and 180 degrees.
What does axis 90 mean on eye prescription?
The axis indicates the angle (in degrees) between the two meridians of an astigmatic eye. The axis is defined with a number from 1 to 180. The number 90 corresponds to the vertical meridian of the eye, and the number 180 corresponds to the horizontal meridian.
What does 150 axis mean in eye prescription?
Answer: Axis is part of your prescription, and tells an optometrist in which direction they must position any cylindrical power in your lenses (required for astigmatism). The number shows the orientation or angle (in degrees) from 1 to 180. The number 90 means vertical position, and 180 horizontal.
Can the axis of your eye change?
Small changes to the shape of your cornea can often cause large changes in the axis measurement, although these are rare. If the axis has changed by more than 90 degrees, you may wish to clarify this with our eye doctor, as a variation this large is quite unusual.
A glasses prescription is not the same as a contact lens prescription. You may also find that there will be a cylinder and axis value on your glasses prescription, whilst it wont be prescribed for your contact lenses.
What is Axis eye problem?
Astigmatism is a common vision problem caused by an error in the shape of the cornea. With astigmatism, the lens of the eye or the cornea, which is the front surface of the eye, has an irregular curve. This can change the way light passes, or refracts, to your retina. This causes blurry, fuzzy, or distorted vision.
What does 20 Axis mean for glasses?
You may, however, have astigmatism. Most values will be 0.00 to +/-20.00. Axis. Axis is the lens meridian that has no cylinder power to correct astigmatism. The axis number helps your eye care provider to know the direction in which they should position a cylindrical power in the lenses of your glass.
Are both Axis and cylinder the same eye?
The number marked axis describes the orientation of astigmatism. It will be a number between 1 and 180. The number under cylinder provides the lens power needed to correct the astigmatism.