SPH (or Sphere) indicates the eyeglass prescription power, or how strong your lenses need to be to correct your vision. CYL (or Cylinder) indicates astigmatism, a condition where the cornea is irregularly shaped causing blurred or distorted vision.
What does sphere cylinder mean?
'Sphere' is basically a measure of how strong your prescription needs to be. 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.May 6, 2020
What is a normal eye cylinder?
The abbreviation stands for Cylinder. It represents the amount of lens power you need for astigmatism. If you do not have astigmatism, you may not have anything indicated in this column. The value may be a plus or a minus, and in most cases, the value will be between +/-0.25 to +/-4.00.Nov 5, 2018
What is cylinder in prescription?
Cylinder: The Cylinder rating is another important part of your eyeglass prescription, which refers to the amount of Astigmatism in your eyes. The Cylinder number is usually accompanied by a minus sign which represents the difference in power that exists, as the Doctor measures how your eyes focus light.Apr 27, 2017
Is my eye prescription the sphere or cylinder?
It always follows the sphere power on an eyeglass prescription. The number in the cylinder column may have a minus sign (for correction of nearsighted astigmatism) or a plus sign (for farsighted astigmatism).
What prescription is sphere?
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 cylinder on eye prescription?
Cylinder (CYL) – This indicates the amount of lens power for astigmatism and represents the difference in the greatest and weakest powers of the eye, usually separated by 90 degrees.
What is the difference between cylindrical and spherical eyesight?
The term "cylinder" means that this lens power added to correct astigmatism is not spherical, but instead is shaped so one meridian has no added curvature, and the meridian perpendicular to this "no added power" meridian contains the maximum power and lens curvature to correct astigmatism.
What does sphere mean in cylinder?
What does Sphere, Cylinder and Axis mean? ... 'Sphere' is basically a measure of how strong your prescription needs to be. 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.May 6, 2020
What is sphere and cylinder in glasses?
SPH (or Sphere) indicates the eyeglass prescription power, or how strong your lenses need to be to correct your vision. CYL (or Cylinder) indicates astigmatism, a condition where the cornea is irregularly shaped causing blurred or distorted vision. It also tells the lens strength needed to fix it.
Do you use sphere or cylinder for contact lenses?
This is one. It is an additional measurement to ensure the contact lens fits correctly. Basically, the cylinder means that the lens power added to correct the astigmatism is not spherical. Since the eye is not perfectly round, this is the correction to the curvature of the lens so it fits the eye correctly.
Is Cylinder bad eye prescription?
Higher numbers typically require more vision correction and therefore a stronger prescription. If you see CYL, which stands for “Cylinder” and “Axis” in your prescription, you friend, have astigmatism. Having astigmatism simply means that there is an imperfection in the spherical curvature of your eye.