# Contact Lens Prescription Axis

Contact Lens Prescription Axis. What does axis mean on my prescription? The axis number on your prescription tells your optician in which direction they must position any cylindrical power in your lenses (required for people with astigmatism).

It is not a substitute for a professional contact lens fitting by a qualified eye care practitioner. The number 180 corresponds to the horizontal meridian of the eye. The axis value directs where to place the power in the lenses.

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Typically given in 10s. the axis figure on a contact lens prescription can be between 1 and 180. This is fairly similar to eye glasses as well.

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The main function of contact lenses is to correct eye conditions. For the left) a prescription for glasses forms the basis for a contact lens fitting.

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The axis is measured in degrees and indicates the orientation of the cylinder in the lens. The three main measurements on your contact lenses are power. base curve and diameter.

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If you look at your prescription it will be in a format similar to one of these; * the calculator is designed to help eye care practitioners.

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The values of cylindrical power in contact lenses is normally measured in increments of 0.25. but in a minus number format. The number 180 corresponds to the horizontal meridian of the eye.

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The number 90 corresponds to the vertical meridian of the eye. This number indicates how curved your contact lens is.

#### The Axis Is Defined With A Number From 1 To 180.

With reference to the eye. picture a clock face centered on the pupil. Typically given in 10s. the axis figure on a contact lens prescription can be between 1 and 180. Ie sphere/cylinder * axis the r.

#### The Reason Is Because A Contact Lens Prescription Includes A Base Curve And Diameter Measurement. Which Determine How The Contact Lens Will Fit Onto Your Eye.

This stands for add power. and is used in bifocal lenses. For the left) a prescription for glasses forms the basis for a contact lens fitting. The axis is a necessary measurement for lenses that correct astigmatism.

#### Ninety Means That The Cylindrical Power Is Positioned Vertically To Correct Your Astigmatism. Whereas 180 Would Suggest It Is Positioned Horizontally.

This comes in the form of a graph or table in your eye care paperwork. The values of cylindrical power in contact lenses is normally measured in increments of 0.25. but in a minus number format. The axis is measured in degrees and indicates the orientation of the cylinder in the lens.

#### Your Prescription Will Also Contain An Expiration Date.

With reference to the eye. picture a clock face centered on the pupil. The add power is measured in diopters. and even if a plus sign is not written on the prescription. it is automatically assumed. A cylinder value refers to the power that you need for correcting your astigmatism.

#### An Axis Of Zero Or 180 Is Shown By A Hand On The Clock Face Pointing To.

This is typically one to two years from the date that the contact. This number shows the orientation or angle in degrees from 1 to 180. Regular soft contacts do not correct for your astigmatism. but your eye doctor will typically try to partially correct for it by changing the power of the lens.