Top number equates to the distance (in metres) at which the test chart was presented (usually 6m), Bottom number identifies the position on the chart of the smallest line read by the ‘patient ‘. Eg; 6/60 means the subject can only see the top letter when viewed at 6m.
How do you interpret Snellen results?
Top number equates to the distance (in metres) at which the test chart was presented (usually 6m), Bottom number identifies the position on the chart of the smallest line read by the ‘patient ‘. Eg; 6/60 means the subject can only see the top letter when viewed at 6m.
How do I read my eye test results?
When you look at your prescription for eyeglasses, you will see numbers listed under the headings of OS and OD . They are Latin abbreviations: OS (oculus sinister) means the left eye and OD (oculus dextrus) means the right eye. Occasionally, you will see a notation for OU, which means something involving both eyes.
What do Snellen chart numbers mean?
The top number is your distance in feet from the chart . The bottom number is the distance at which a person with normal eyesight can read the same line. For example, if you have 20/30 vision, it means your vision is worse than average. Twenty feet away, you can read letters most people see from 30 feet.
What does a Snellen chart reading of 20 10 indicate?
In the rare instances where vision may test better than normal on a Snellen chart, a value of 20/10 vision means that you can see clearly from a distance of 20 feet , what a person with normal vision sees well at a distance of 10 feet.
What do the numbers mean on eye test results?
In general, the further away from zero the number on your prescription, the worse your eyesight and the more vision correction (stronger prescription) you need . A “plus” (+) sign in front of the number means you are farsighted, and a “minus” (-) sign means you are nearsighted.
What is a normal eye test results?
Normally, a value of 20/20 is considered to be optimum, or perfect vision. Individuals who have 20/20 vision are able to read letters that are 3/8 of an inch tall from 20 feet away. If you don’t have 20/20 vision, you have what is called a refractive error.
What does 20 70 mean when performing a vision test?
The ratio measurement of vision describes visual acuity, or the sharpness of vision, at 20 feet from an object. For example, having 20/70 vision means that you must be at 20 feet to see what a person with normal vision can see at 70 feet.
What does a 20 40 vision mean?
If you are diagnosed with 20/40 vision, it means that at 20 feet – you can only see the details that a person with normal vision sees at 40 feet.
What line is 20 40 on the eye chart?
The third line is equivalent to 20/40, it is the driver’s test line . You must be able to read most of the letters on this line in order to obtain an unrestricted drivers license in most states including Ohio.
How do you explain 20/20 vision?
20/20 vision is a term used to express normal visual acuity (the clarity or sharpness of vision) measured at a distance of 20 feet . If you have 20/20 vision, you can see clearly at 20 feet what should normally be seen at that distance.
What does +0.25 mean on an eye test?
If your number is between -0.25 and -2.00, you have mild nearsightedness . If your number is between -2.25 and -5.00, you have moderate nearsightedness. If your number is lower than -5.00, you have high nearsightedness.
What is normal eye axis?
An eye doctor will examine an individual’s eyes to determine any vision problems or refractive errors. One aspect that eye doctors will consider is the eye axis. The axis is the lens meridian that does not contain cylinder power, defined by a number between 1 and 180 degrees .
What is bad eyesight number?
If you have a visual acuity of 20/200 or worse (after putting corrective lenses
What does 6’5 mean in an eye test?
A person with better than normal vision will have a denominator that is less than 6 e.g. 6/5 i.e. a person with this grading of visual acuity can read at six metres what a person with normal visual acuity can only read at 5 metres .
What does Plano mean in glasses?
If your prescription has the word Plano, PI, or an infinity sign, it means that you do not have distance problems . You may, however, have astigmatism. Most values will be 0.00 to +/-20.00. Axis. Axis is the lens meridian that has no cylinder power to correct astigmatism.
