How do you interpret refraction results?

Normal Results If your uncorrected vision (without glasses or contact lenses) is normal, then the refractive error is zero (plano) and your vision should be 20/20 (or 1.0). A value of 20/20 (1.0) is normal vision. This means you can read 3/8-inch (1 centimeter) letters at 20 feet (6 meters).

What is 6 12 line on the eye chart?

If this is the smallest line a person can read, the person’s acuity is “6/12” (“20/40”), meaning that this person needs to approach to a distance of 6 metres (20 ft) to read letters that a person with normal acuity could read at 12 metres (39 ft).

What does 6 60 mean in an eye test?

On the Snellen scale, normal visual acuity is called 6 / 6, which corresponds to the bottom or second bottom line of the chart. If you can only read the top line of the chart then this would be written as 6 / 60. This means you can see at 6 metres what someone with standard vision could see from 60 metres away.

What is normal refraction?

When light passes from a less dense to a more dense substance, (for example passing from air into water), the light is refracted (or bent) towards the normal. The normal is a line perpendicular (forming a 90 degree angle) to the boundary between the two substances.

How do I read my eye prescription?

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 line is 6 60 on the Snellen chart?

What is the meaning of 6/6/3 in glasses prescription?

Strictly speaking, 6/6–3 isn’t part of the prescription. It refers to the amount of detail you can see once you are looking through your spectacle prescription. Over a century ago, scientists worked out what detail the eye could see (the “resolving power”) and decided it was around one minute of arc at six metres.

What do the numbers on my spectacle prescription mean?

The numbers on your spectacle prescription are shown for your right eye (indicated as RE or sometimes OD – the Latin for oculus dexter, meaning right eye) and your left eye (LE or OS – oculus sinister). Most optometrists use RE and LE but you will sometimes come across OD/OS in eye hospitals and some ophthalmologist’s practices.

What happens when you get a refraction test?

When one eye is tested, the procedure is repeated on the other eye. This process gives the doctor the necessary information to prescribe lenses that will give the patient 20/20 vision. Everyone should get a refraction test, even if they have otherwise healthy eyes. As a person ages, the structure and functioning of their eyes change.

What is the prescription for prismatic correction for presbyopia?

Both eyes are being prescribed an “add power” of +2.00 D for the correction of presbyopia, and this eyeglass prescription includes a prismatic correction of 0.5 prism diopter in each eye. In the right eye, the prism is base down (BD); in the left eye, it’s base up (BU).

https://www.youtube.com/watch?v=nw1ACmPtxTk