How To Read Contact Lens Prescription Power

September 14, 2021 Post a Comment

The higher the power number the stronger the prescription is. Understand the sphere power of your lenses.

How To Read Your Contact Lens Prescription

In part 1 part 2 and part 3 of this tutorial series you learned all about how lenses work why prescriptions for glasses are sometimes different than prescriptions for contact lenses and how to calculate a contact lens prescription from a prescription for glasses.

How to read contact lens prescription power. Eye Power sphere BC Dia and Brand. Acuvue Base Curve a number between 80 and 100 Diameter a number between 130 and 150 Power Sphere Rx a number between -2000 and 2000 Astigmatic Toric Prescriptions also include. Presbyopia affects your near vision and this is the power that you need to be able to see up close.

Contact prescriptions may differ from spectacle prescriptions due to vertex distance the distance between the surface of the eye and the lens. Part 4 The Power Cross Advanced Conversion Charts. The power of your lens in measured in dioptres and this indicates the level of correction your lens must provide to correct and sharpen your vision.

The contact lens sits on the surface of your eye while your eyeglasses sit about 10-12 mm in front of your eyes. Read the measurement of the diameter DIA given in millimeters. Contact lens manufacturers make lenses in 025 D power increments.

This tells you what eye the prescription is for. The spherical power indicated on the prescription as power PWR or sphere SPH of a soft contact lens is calculated in a unit of measurement equal to the reciprocal of the focal length of a lens called a diopter D. The Base Curve represents the curvature of the Contact Lens that is fit to the cornea.

Cylinder a number between -400 and 400 Axis a number between 0 and 180 Cylinder. Sphere power is the primary power in the lens to correct either hyperopia farsightedness or myopia nearsightedness. If the power on the glasses prescription is negative then the converted power is directly to the left.

The Eye column will contain either OD OS or OU which mean right eye left eye or both eyes respectively. This accounts for the differences in power between the two lenses. Reading the contact lens power.

This is the distance from one edge of the contact lens to the other. The unit of measure for sphere power is a dioptor or D. The prescription should unfold in the following way.

Obviously contacts will rest on the surface of the cornea whereas spectacles lenses will generally be about 12 mm from the surface of the cornea to the back of the lens. A different way of going about getting a reading contact lens prescription may be to try something called monovision. The correct power should normally give you 2020 vision.

OD right eye OS left eye Power or Sphere Base Curve Diameter Cylinder Axis and an. On the contact lens box read the prescription information from left to right. Look for the expiration date on your contact lens prescription which is usually about one year from the date you have the lenses fitted.

Another area in which you will want to be familiar is the Base Curve of your eye. If your prescription shows a minus sign -. That indication is marked by BC on you lens prescription and will be a number between 8 and 9.

OD right eye OS left eye Lens Name eg. Sphere power is positive if you are farsighted and negative if you are nearsighted. Monovision is wearing a contact lens in one eye that makes everything clear in the distance and a different contact lens in the other eye that makes everything clear up close arms length.

Your prescription will also contain an expiration date. Contact Lens Prescriptions usually contain the following parameters. Look for a minus sign to indicate nearsightedness myopia and a plus sign that indicates farsightedness.

If the power on the glasses prescription is positive then the converted power is directly to the right. D N Also if you are wearing a presbyopia contact lens you will find that your doctor wrote D and N on your prescription. Read the power PWR of the lens strength it may be different for each eye measured in diopters.

The greater the sphere power is from zero the stronger the prescription. These are the Basic Parameters of a Contact Lens Prescription. This just indicates which eye is the dominant eye and.

Base curve diameter power or sphere and then additional figures for Cylinder and Axis if you have astigmatism and Addition and Dominant. Your eye doctor will change the power of the lens in order to give you a prescription that will work for you. 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.

The spherical power of a lens is indicated with a plus sign for hyperopia and a minus sign - for myopia. This is typically one to two years from the date that the contact lenses were fitted. ADD If you are wearing a presbyopia contact lens then you are going to have an ADD value on your contact lenses.

A written prescription usually includes the following specifications. You can find your prescription on the piece of paper given to you by your optician during a check-up on the endside of your contact lens box or on the blister packs that contain your contact lenses. The Glasses Lens Power column refers to the power on the glasses prescription.

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