What is normal size for eye contacts?

How do you know your eye size for contacts?

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.

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.

How do you know if your contacts are too big?

If your eye is shaped flat like a plate, and you wear a contact lens that is shaped like a bowl, the lens is going to fit too tight. You will feel the edge of the lens where it rests on your eye, your eye may become red as the day progresses, and you may develop inflammation.

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What is the average diameter of an eye?

The size of a human adult eye is approximately 24.2 mm (transverse) × 23.7 mm (sagittal) × 22.0-24.8 mm (axial) with no significant difference between sexes and age groups. In the transverse diameter, the eyeball size may vary from 21 mm to 27 mm.

What happens if you wear the wrong size contacts?

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.

What’s the difference between 8.4 and 8.8 base curve?

The 8.4mm base curve is still the likely best fit for the majority of eyes. In instances when the 8.4mm lens is too steep, the 8.8mm lens allows a flatter option. This is more likely needed in smaller eyes, and possibly in some very flat corneas.

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.

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.

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How can I tell if my contacts don’t fit?

Top Signs of Contact Lens Discomfort

  • Stinging, burning and itchy eyes.
  • Abnormal feeling of something in your eye.
  • Excessive tearing.
  • Unusual eye secretions.
  • Eye redness.
  • Poor visual acuity.
  • Blurred vision or halos around objects.
  • Light sensitivity.