13. February 2016 12:30
In spite of the fact that contact lens materials and designs are constantly improved, some patients still discontinue lens wear due to inadequate comfort or vision. This, according to the latest research, can be prevented, as the success of a fit can be evaluated within the first 10-20 minutes.
The scientists designed their study to find out how initial fit results can predict the eventual level of comfort and vision in patients beginning to wear HEMA and silicone hydrogel contact lenses. The study included thirty subjects, who were thoroughly examined and then fitted with the two types of contact lenses. Then, 5, 10 and 20 minutes as well as 8 hours later, the most important fit parameters (such as lens centration, post-blink movement, push-up recovery speed and comfort) were assessed and compared.
No comfort and centration differences between HEMA and silicone hydrogel contact lenses were found. In addition, the researchers discovered that lens movement on blink and push-up recovery speed, both of which have a huge impact on contact lens comfort and quality of vision, evaluated after 5-20 minutes of wear reflected what was found after 8 hours of continuous contact lens use.
Commenting on their findings, the researchers stated that eye care practitioners can easily predict the ultimate results of contact lens fitting and optimise the process, appropriately adjusting lens parameters.