How do you know what size contact lenses to get?
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.
Is it bad to wear the wrong size contact lens?
Wrong Diameter Symptoms
Contact lens diameter too big will cause your problem. The wider of the lens the better enlarging effect you could have. But bear in mind if the diameter is too big, the lens will be loose in the eye and may slip out of place.
What is the difference between 14.0 and 14.2 diameter contacts?
14.0mm and 14.2mm 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. … In other words, the predominant size for the small contacts is between 14.0mm to 14.2mm.
Are contacts one size fits all?
There’s no such thing as a one size fits all contact lens. If you try to wear a contact that doesn’t fit the particular curve of your eye, it might fall out or put you at risk of an eye injury.
What does 8.5 mean on contacts?
Contact Lens Base Curves and Diameters
|CONTACT LENS||POWER (SPH) RANGE||BASECURVE|
|Acuvue Bifocal||+6.00 to -9.00||8.5|
|Acuvue Oasys||+8.00 to -12.00||8.4, 8.8|
|Acuvue Oasys 1 Day||+8.00 to -12.00||8.5, 9.0|
|Acuvue Oasys for Astigmatism||+6.00 to -9.00||8.6|
What happens if contacts don’t fit right?
If your contacts don’t fit properly you could experience a wide range of symptoms. … Other symptoms include excessive tearing of the eyes, unusual eye secretions, redness, dryness and sensitivity to light.
What happens when contacts are too small?
When a contact lens on your eye shrinks, it can squeeze the front of your eye like a suction cup and cause the cornea to swell. It is important to get treatment. Tight lens syndrome can put you at risk for a serious infection that can cause a corneal ulcer, which can cause permanent scarring and vision loss.
How important is diameter in contact lenses?
It’s very important because it shows in which part of your eye the edges of the contact lens will rest. If the diameter is wrong, too small or too large it wont be stable on your eye and move around too much or it can be too tight and cause eye irritation and corneal abrasions.
What happens if I wear contacts with the wrong base curve?
If your lenses have the wrong diameter or base curve, you’ll likely feel that something is always in your eye. If the lenses are too flat, your eyelids will tend to dislodge them when you blink. The wrong size lenses can even cause an abrasion of your cornea.
Can I wear contacts with a slightly different base curve?
Can I order contact lenses with a different base curve? You should never order contact lenses with a base curve that is different from your prescription. This can damage your eyes and cause problems with vision.
How do you know the diameter of your eye?
For accuracy and consistency, always measure from the white part of one side of the eye directly across to the white part of the other side of the eye. Reference the example image below; the corneal diameter or visible iris diameter measures 12.01mm.