What do numbers mean on contact lens prescription?
Read the power (PWR) of the lens strength (it may be different for each eye), measured in diopters. The higher the power number, the stronger the prescription is. Look for a minus sign to indicate nearsightedness (myopia) and a plus sign that indicates farsightedness (hyperopia).
How do you read a prescription for contact lenses?
How to Read Your Contact Lens Prescription
- OD: Oculus dexter, the Latin term for right eye.
- OS: Oculus sinister, the Latin term for left eye.
- PWR: Power (also referred to as Sphere or SPH)
- BC: Base Curve (usually a number between 8 and 10)
- DIA: Diameter (usually a number between 13 and 15)
What is the highest prescription for contact lenses?
What is the strongest contact lens prescription? Contact lenses can be prescribed for extreme degrees of myopia, even for those who need correction of more than -20 Dioptres. Some lenses can go over -30 Dioptres. For monthly soft contact lenses, the highest level of corrective power is about -12 Dioptres.
What does D and BC stand for on contacts?
Contact Lenses Base Curve or BC: Indicates how curved the inside of your lens is, usually ranging from eight to 10. Diameter or DIA: The width of the contact lens from edge to edge, measured by millimeters. Brand: This is the name of the specific contact lens brand or type you’ve been prescribed.
Why does my contact say 123?
Look at the outside surface of the lens from the side: If the “123” appears normally, the lens is correctly oriented and ready to be placed on your eye. If the “123” is backward, the contact is inside out.
What prescription strength is legally blind?
Visual acuity less than 20/200 is considered legally blind, but to actually fit the definition, the person must not be able to attain 20/200 vision even with prescription eyewear. Many people who would be legally blind without eyewear can function well in everyday life with appropriate glasses or contact lenses.
What prescription is blind?
What prescription is considered legally blind? Legal blindness is defined as 20/200 vision. The prescription equivalent is -2.5.
What is normal BC for contacts?
Your prescription will also contain an expiration date. This is typically one year from the date that the contact lenses were fitted. BC values range from about 8.0 to 10.0.
Do all contacts have 123 on them?
Most ACUVUE® Contact Lenses also have a 123 indicator, so you can easily tell when they are inside out. If the numbers are the right way around, so is the lens.
Which way should 123 be on contacts?
Some contact lenses have laser markings that are present to help you to tell whether they are turned correctly. These markings may be numbers, such as ‘123’, which, when viewed from the side, should read normally from left to right.
Is 8.6 base curve normal?
In fact, a 2017 mathematical analysis revealed that a 8.6 base curve and 14.2 mm diameter contact lens achieved a successful fitting relationship in 90% of patients.
Is the a big difference between 14.0 and 14.2 diameter contacts?
In fact, there is not much difference between these two. Some manufacturers only make 14.2mm diameter contacts, and some others produce 14.0mm diameter contacts. However, there is no manufacturer that makes both 14.0mm and 14.2mm diameter contacts.
What does 8.4 mean on contacts?
E.g. BC 8.4. Diameter: This stands for Diameter and is the length of the contact lens from one edge of the lens to the other. This is effectively the size of the contact lens and is used to make sure the contact lens covers the correct parts of your eye.
Why does my contact lens say 123 on it?
Can you put contacts in the wrong way?
Inserting a contact lens the wrong way round doesn’t just make the lens ineffective at correcting vision. It can be an uncomfortable experience, and may cause damage to your eye if worn for long periods of time. It can be difficult to tell when your contact lenses are inside out, unless you know what to look out for.
How do I know my contact lense size?
Generally, your eye doctor will use a keratometer to measure the curve of your cornea, which is the front surface of the eyes – where contacts rest. These numbers help to determine the lens diameter and base curve that appear on your contact lenses prescription.