It is not recommended to wear contact lenses with a different diameter from your prescription. If the diameter is too wide, the lens will be loose in the eye and may slip out of place. If the diameter is too small, the lens will have a tight fit, causing discomfort.
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 is DIA 14.2 contact lenses?
14.2mm diameter contacts are the most sold contact lens size among multi-months color contacts. DIA 14.2mm means the total size of the contact lens is 14.2mm. 14.2mm contacts are considered small size contacts that give a little expansion effect on the eyes.
What is the normal BC for contact lenses?
Typical base curve values range between 8.0 and 10.0 mm, though it can be flatter (from 7.0mm) if you have a rigid gas-permeable lensrigid gas-permeable lensA rigid gas-permeable lens, also known as an RGP lens, GP lens, or colloquially, a hard contact lens, is a rigid contact lens made of oxygen-permeable polymers. Rigid lenses are able to replace the natural shape of the cornea with a new refracting surface.https://en.wikipedia.org › wiki › Rigid_gas_permeable_lensRigid gas permeable lens - Wikipedia. A person with a higher base curve number has a flatter cornea (the clear, front surface of the eye) compared to someone with a lower base curve number, which indicates a steeper cornea.
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. Many 14.0mm contacts users use 14.5mm or 14.8mm contacts to demonstrate dolly effects on their eyes.
What does Dia mean in contact lenses?
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. E.g. DIA 13.8.
Does the BC and Diam matter a lot when buying contacts?
Both the Base Curve (BC) and Diameter (DIA) of a contact lens ensures a proper fit on your cornea and total eye surface. Those features ensure comfort and encourage eye health, including allowing proper oxygen to the eye. You'll also need this information if you want to order contact lenses online.
Is it okay to wear contacts with a 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.
Should I get 8.4 or 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.Jul 1, 2008
Is there a big difference between 8.3 and 8.4 base curve?
Yes that is a big difference. 8.4 would be a much smaller curvature than what you normally wear and probably would not fit your eye properly. You should send those back and use the size that you normally wear.
Is there a big difference between 8.5 and 8.6 base curve?
No there is not a big diff between the two base curves. However, it's the relationship between diameter and base curve that is more important. Also, the material of the lens can also affect the fit. You can have 3 diff contact lenses with the same BC, Diameter and power and they will all fit differently.
Is there a big difference between 8.4 and 8.6 base curve?
Studies show that a single base curve of 8.4mm managed a “good or better” fit in approximately 90% of individuals,1 and base curves of 8.4mm and 8.6mm together encompassed 98% of individuals.Sep 1, 2017
What is the normal power of contact lens?
The correct power should normally give you 20/20 vision. If your prescription shows a minus sign (-) this means that you are short-sighted and have myopia. If your prescription shows a plus sign (+) this means that you are long-sighted and have hyperopia.May 3, 2019
Is BC important in contact lenses?
The 'BC' or base curve measurement indicates the back curvature of your contact lens, in millimetres. This is important for comfort, as the BC of your contact lenses should match your eye's natural curve as closely as possible to ensure a better fit when you are wearing your contact lenses.