What is the contact lens base curve?
lthough contact lenses are good, if the
parameter of base curve is ignored, it may also cause a lot of discomfort in
the eyes. So, what is the parameter of base arc, and how should it be selected?
The base curve of a contact lens is the
degree of curvature of the lens, abbreviated as BC. The base curve of the eyes
of Chinese people is mostly between 8.4-8.6, and there are very few exceptions.
Therefore, most of the contact lenses sold on the market also fall into this range.
If the base curve of the lens does not match the base curve of the eye, even
the best brand and the best quality will make it uncomfortable to wear.
Therefore, for first-time wearers, it is best to measure the base curve first
to facilitate the selection of more suitable contact lenses.
If you want to determine whether the base
curve of the lens is suitable, you must first put on the contact lens and
gently push the edge of the lens with a clean fingertip. If the lens is easily
pushed and slid, and it will shift with the blink of the eye, it means that the
base curve of the lens is too large; on the contrary, if the base curve of the
lens is too small, it will tightly hug the eyeball, which is easy Feeling sore
and tired in the eyes.
The base arc is not a particularly important
parameter, but it cannot be ignored at will. The use of contact lenses with a
suitable base curve is conducive to maintaining good and stable vision effects
and avoiding damage to the eyes. Of course, there will also be cases where the
base arc cannot be completely matched. At this time, you can choose the closest
value, but you should pay attention to choosing the big or not the small, as
long as the difference is within 0.2mm.
Before fitting contact lenses, you can get
detailed and accurate eye data by undergoing an ophthalmological examination,
and then choose the right lens in combination with your eye habits to ensure
comfortable wearing and stable vision.