Table of Contents
What is the normal axis of the eye?
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. The number may be between 1 to 180, where 90 represents the vertical position while 180 represents the horizontal position.
What is normal cylinder and axis?
In eyeglass prescriptions, optometrists will note both the cylinder power and axis. The cylinder power is the strength of astigmatism correction needed. If the axis is 180 degrees, you may see it noted as x180. Those with a “normal” eye axis will not see these values in their eyeglass prescriptions.
What is SPH and CYL and axis?
Website Form. Type 1: Spherical (SPH) Only Power. 60\% people have only spherical (SPH) power with no Cylinder (CYL) and Axis (AXIS) Note: For making these specs, we do not need other information of your prescription such as 6/6 or 6/4 or PD (pupillary distance) Type 2: Spherical with Cylinder (CYL) Power.
What is SPH in eyes?
Sphere (SPH) – The term “sphere” means that the correction for nearsightedness or farsightedness is spherical, equal in all meridians of the eye. This indicates the amount of lens power, measured in diopters (D), prescribed to correct nearsightedness or farsightedness.
What is SPH eye?
How do you know if your eye axis is normal?
If the axis is 180 degrees, you may see it notated as x180. Individuals with a “normal” eye axis will not see these values in their eyeglass prescriptions because they do not have astigmatism. People with a normal eye axis have strong and clear vision because the light is falling at the right place on the retina.
What is the cylinder power of the human eye at zero?
When the cylinder power is zero, the axis is irrelevant. In reality, most “normal” eyes have about 0.50 diopters of negative cylinder power at axis 180 (horizontally), so a typical eye would have a prescription of plano (0.00 diopters sphere) -0.50 x 180.
What does no CYL or axis mean for left eye?
You will notice there is no CYL or AXIS for the left eye, this means there is no astigmatism present. Your optician may or may not write DS (Dioptres Sphere) in the CYL box. DS (Dioptres Sphere) means you only have a Sphere power.
What does the axis value on an eyeglass prescription mean?
The axis does not indicate the strength of an eyeglass prescription. Instead, these numbers reflect the location of any astigmatism present. This will be helpful for opticians when an eyeglass prescription has cylinder power (CYL value). The axis value directs where to place the power in the lenses, so individuals with astigmatism can see better.