I went to the eye doctor today and was so surprised to learn that my prescription has changed quite a bit in a short amount of time. I had an exam in Sept. 06 and my Right eye was : Sphere +4.50 Cylinder + 4.00 and Axis 86. Left eye: Sphere +4.50 Cylinder + 2.25 and Axis 96. My current prescription is Right eye: Sphere +8.25 Cylinder -3.25 Axis 175 and Left eye Sphere +6.50 Cylinder -2.50 and Axis 012. I am 37 and have always worn glasses. I go to the Dr. regularly to ensure that my eyes are healthy. Is it possible that the Dr. made an error or is it possible for my farsightedness to have increased so dramatically? Thanks for your response.
Hello ediegirl, There is really very little difference in those two prescriptions. One is written in PLUS CYLINDER notation and the other is MINUS CYLINDER notation.
I borrowed this from a website if you interested in how the two are interchanged.
Not to worry. You are howeve very farsighted and this can sometimes cause crossed eyes or strabismus in infants and children and angle closre glaucoma in older adults. See an ophthalmologist year.
JCH III MD
Transposing a glasses prescription is simply converting the prescription from minus cylinder notation to plus cylinder notation. The optical properties of the prescription remain the same.
1) Algebraically add the cylinder power to the sphere power to arrive at the new sphere power.
2) Change the sign of the cylinder power.
3) Add or subtract 90 from the axis.
Example 1— Transpose the following prescription:
+2.00 – 2.50 x 105
1) +2.00 – 2.50 = - .50 (new sphere)
2) -2.50 changes to +2.50 (new cyl.)
3) 105 – 90 = 15 (new axis)
-.50 +2.50 x 15
Example 2 —
+1.00 + 3.00 x 35
1) +1.00 + 3.00 = +4.00
2) +3.00 changes to – 3.00
3) 35 + 90 = 125
+4.00 – 3.00 x 125
Why are there plus and minus cylinders? Plus cylinder lenses exist only in phoropters and trial lenses. Glasses lenses are made in minus cylinder. Plus cylinder phoropters are popular because it is easier to teach retinoscopy in plus cylinder. Ophthalmologists typically learn retinoscopy and refraction in plus cylinder. Optometrists typically use minus cylinder.
From Hollywood stars to your yoga teacher, it seems that everyone swears by a detox diet. But does it actually work? And is it even healthy? Cardiologist and weight loss expert James Beckerman, MD, weighs in
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.