By Asst. Prof. Dr. Nawat Watanachai
Ask
Hello
Who wears contact lenses?
- People say that wearing contacts for a long time causes the lacrimal glands to produce less than usual.
- And will cause a lot of blood vessels in the whites of the eyes, is it true?
Reply
Hello
Insertion of a contact lens (CL) impedes the transmission of oxygen between the air and the cornea.
(The cornea needs oxygen from its face to be exposed to the outside air by dissolution.
of oxygen through the tears) is reduced. Therefore, in some CL users with
Deficiency in tears (either in terms of quantity and/or quality of tears)
Will reduce the transmission of oxygen - tears - corneal pupil.
As a result – the cornea suffocates. causes corneal epithelial cells to black, which play a role
in terms of keeping the cornea black and clear all the time Down the number.
eye immunity Especially in the cornea, the black eye has decreased. more vulnerable to infection
The rate of CL users with proper care. (Do not put overnight not lazy to wash)
At 1: 200: 1 year (in one year, 200 people use CL correctly, there will be 1 person who will have severe and non-severe infections)
or in some cases In people with irritation / allergies to substances contained in various solutions
There is some expansion of this blood vessel as well, some blood vessels grow to the point of germination.
Go on the black eye glass.
In some countries, everyone wearing a CL is required to undergo three of four basic tests:
- curvature of the cornea
(CL has multiple curvatures It is important to choose the right curvature for each individual eye)
EN 
TH