WHICH IS RIGHT AND LEFT OD OS HOW TO
WHICH IS RIGHT AND LEFT OD OS PLUS

There is not much of a big increase and that is why your eye feels strain. It could be that your astigmatism got a little worse, that’s all. First of all, why did you get 2 eye exams within the same year? Have you been noticing a change in your vision or were you recommended to? Usually an eyeglass prescription is good for 1-2 years and a contact prescription is good for only 1 year. Thank you in for your question and I am sorry that it has taken me this long to answer it. Please check the above link and let me know (by e-mail if possible). This is the link of the website I am talking about (so that you can see what I mean) How can I know the correct ‘PowerOD’ and’PowerOS’ values so that I can proceed with my contacts’ order? What do all these values mean in the European system? How can I find out my diameter in the US metric system? There’s also a ‘BC’ box that has a standard 8.6 value.

The website has only one eye diameter option which is 14.5 whereas my prescription reads 65. I have my doctor’s eyeglasses prescription but I fear that the measuring system differs between Europe and the US. The website is American and I am from Greece. It has a ‘PowerOD’ and a ‘PowerOS’ option which I have to provide so as to proceed with my order. Hi, I want to buy a pair of Halloween contact lenses and there’s an option at the website that confuses me.

Axis:This number measurement describes the astigmatism in degrees from the horizontal (most left and right eyes have the same axis in astigmatism) axis.

Cylinder: This number measurement refers to the amount of astigmatism (an irregularly shaped cornea which causes blurring) in the eye.

Sphere: This number measurement reflects the extent of the nearsightedness or farsightedness.

OD ( Oculus Dexter) stands for right eye and OS ( Oculus Sinister) for left eye, while OU ( Oculus Uterque, Oculus Unitas or Oculus Uniter) means both eyes. The letters OD and OS in front of a prescription let us know which eye each string of numbers is for. They usually go from +0.75 to +3.00, depending on age and visual need. Lastly, there can also be numbers denoting the amount of near reading strength needed (bifocal or progressive). There may be more than one set of prism numbers for each eye. For instance, if the basic prescription is followed by a small number with a superscript (1^) it indicates prism correction. There may be additional numbers in a glasses prescription. We use the numbers from 90 to 180 to indicate the orientation of the football shape.

Astigmatism, a football-shaped eye, can be measured in any direction around the clock. The final number (180) is the direction (AXIS) of the astigmatism. If there is no astigmatism, we generally write the letters DS or SPH after the first number to let the optician know that we didn’t just forget to write in the astigmatism. The second number (-1.00) is the astigmatism.

WHICH IS RIGHT AND LEFT OD OS PLUS

A plus sign would indicate farsightedness. In this case, because there is a minus sign in front of the 2.00, this patient is nearsighted. The first number (-2.00) tells us the spherical refractive error (farsightedness or nearsightedness).

WHICH IS RIGHT AND LEFT OD OS HOW TO

When you have your eye exam and the doctor gives you a copy of your eyeglass prescription, do you know how to read it? What does OD, OS, and OU mean?Īn eyeglass prescription is written in a standardized format with standardized notation so it can be interpreted worldwide.

Which is right and left od os