Contact To Glasses Conversion Calculator

Use this toritrack calculator plus your fitting process to find the right contact lenses for astigmatic patients.

Contact to glasses conversion calculator. Glasses lenses rest an average of 10 millimeters away. The power changes depending on how far a corrective lens is from the eye. Sphere is usually written as sph make sure to include the symbol in front of this value if plus or the symbol if minus. Choose the type of lens выберите бренд контактных линз.

Refer to our toric or multifocal calculators for other prescriptions. How to convert your glasses prescription to contacts. Meaning oculus dexter and is placed just above the o s. Enter your sphere number into the sphere tab.

Use our spectacle conversion calculator to convert a patient s prescription for glasses to the corresponding contact lens parameters. Convert spectacle refraction to initial lens power recommendations for our soft lens products. The lens power is different as you move a lens further from the eye and the numbers will be different in a contact and glasses prescription beginning around 4 00 1. Use our sphere spectacle conversion calculator to easily convert a patient s eyeglasses prescription to the corresponding contact lens parameters and use your expertise to make further refinements.

Contact lenses sit right on the cornea. Sphere spectacle calculator here s a handy tool for eye care practitioners. Begin with the prescription for your right eye the right eye is usually written as o d. Although the net clarity from contact lenses will be slightly higher since they sit closer to your eyes slightly increasing actual diopters.

Eyeglass prescription positive cylinder conversion. First note that below 3 50 diopters you don t need to make any changes to the diopters between glasses and contact lenses. This formula looks like this. Ophthalmologists and a few older optometrists different types of eye doctors write astigmatism prescriptions with positive cylinders.

To go from a contact lens prescription to glasses the sphere power is put through a mathematical equation called the back vertex formula. Fc f 1 xf theoretically this formula works both ways meaning that you can use it to go from glasses to contacts as well as from contacts to glasses. Click here to see how to transpose an rx manually. The calculator is designed to help eye care practitioners.

It is not a substitute for a professional contact lens fitting by a qualified eye care practitioner. This is because many years ago the instruments used to measure and cut lenses were only able to do so in positive increments. Enter the rx and click the appropriate button to convert the rx to plus or minus cylinder form.