There are lots of type of contact lenses with several parameters, such as the possibility to wear them for a 24-hour long period of use or during the day only. On the one hand, the contact lenses of night and day course can be utilized for a 24-hour long period, whereas the contact lenses of daily course need proper treatment and storage everyday.
Because of a material with a low degree of oxygen permeability of which the contact lenses were manufactured, in the 80's it was not possible to wear the contact lenses while sleeping, as the eyes could not „breathe”. This led to growing cases of infections and serious corneal ulcerations. Therefore, it became clear that healthy complications occurred because of the use of contact lenses in the night.
Nowadays, the contact lenses are made of silicone hydrogel, a material with a high degree of oxygen permeability that allows users to wear the contact lenses with no complications.
Contact lenses of prolonged wearing
They are wearing provide a prolonged comfort during the whole period of use. The contact lenses of prolonged wearing can be utilized for a 30-day long period of use. They are more rigid than the conventional contact lenses are. Therefore, the eye needs more time to adapt than usual.
Contact lenses of daily course
The contact lenses of daily course must be taken off before sleeping, even if users could fall asleep while watching TV or during the day. It is necessary to take the contact lenses of daily course off, clean and store them within a sterile lens holder with a special care solution. Users must repeat the operation below and store the lenses within the sterile lens holder for the next 12 hours if they fall asleep suddenly.
Consequences of the use of contact lenses while sleeping
The use of contact lenses while sleeping leads to several consequences:
- Reddening of eyes along with a sensation of excessive dryness.
- Swollen eyelids.
By considering the consequences, it is strongly recommended to take the contact lenses off before sleeping, in order to decrease all risks of infection.