What does the sphere cylinder and axis mean?

What does the sphere cylinder and axis mean?

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.

What does 1.50 mean on glasses?

This prescription is for the left eye, and -1.50 means that your nearsightedness is measured at 1 and 1/2 diopters. It’s considered a mild amount of nearsightedness. SPH indicates the adjustment for spherical power, with a prismatic correction of 0.5 Base Up.

Is 1.50 astigmatism bad?

Between . 75 and 2 diopters is considered mild astigmatism. Between 2 and 4 diopters is moderate astigmatism, and 4 or more diopters is considered significant or “bad” astigmatism. Generally, eyes with 1.5 diopters of astigmatism or more require correction.

Is astigmatism 175 Axis bad?

The last and 3rd number (180 and 175) is the axis, or the direction of your astigmatism. An axis of 180 degrees, for example, means the astigmatism is horizontal. Therefore, this prescription means that the patient is moderately nearsighted, with a moderate degree of astigmatism in a horizontal direction.

Is 175 Axis bad?

What does axis mean in eye prescription?

Axis – If an eyeglass prescription includes cylinder power, it also must include an axis value, which follows the CYL power. 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.

What does axis mean for astigmatism?

Axis is measured in degrees, and refers to where on the cornea the astigmatism is located. Axis numbers go from 0 to 180. If you think of the eye as a map hanging on a wall, the 90 degree axis or line, runs up and down (or north to south) on the eye.

What is a normal axis for glasses?

The axis is defined with a number from 1 to 180. The number 90 corresponds to the vertical meridian of the eye. The number 180 corresponds to the horizontal meridian of the eye.

What is the difference between a sphere and a cylinder?

The term sphere is used because the correction of either the farsightedness or nearsightedness is equal across all the meridians of your eye, or spherical. Cylinder – Cylinder or CYL is used to identify how much lens power in your prescription is for astigmatism if you suffer from it.

What are axis and sphere in a prescription?

The axis is your prescription’s lens meridian that is set at 90-degrees from the cylinder power-containing meridian that is used for correcting astigmatism. What Are OS and OD? Now that we’ve discussed sphere, cylinder and axis, let’s look at the other main parts of your prescription to round out your understanding.

What does the sphere mean on my eye prescription?

Sphere, Cylinder, and Axis on Eye Prescriptions Sphere: The sphere (SPH) on your prescription indicates the lens power you need to see clearly. A minus (-) symbol next to this number means you’re nearsighted, and a plus (+) symbol means the prescription is meant to correct farsightedness.

What is the difference between SPH and cylinder?

Sphere (SPH): The term “sphere” is essentially the degree of correction needed to correct your near or farsightedness. Cylinder (CYL): The number indicates the lens power needed to correct astigmatism in your eyes. Axis: The axis indicates the orientation of astigmatism, measured in degrees from 1 to 180.