Page 52 - The UK Guide to Laser Eye Surgery
P. 52

52 Questions about technology
 Femtosecond laser
How does it feel?
You may feel some light pressure and gentle pushing and pulling but no discomfort. This may feel a little strange, but it is not painful. While the suction is applied, your vision will go fuzzy.
How does it benefit you?
Femtosecond lasers allow the surgeon to create a thinner flap than is possible using a microkeratome. The femtosecond laser has also enabled the SMILE procedure to be possible.
Excimer laser
What is it for?
Laser refractive surgery for the correction of refractive error. In short-sighted patients, the laser flattens the cornea in the central zone. In long-sighted patients, the laser flattens the cornea in the peripheral (outer) zone. In astigmatic patients, the laser flattens or steepens the cornea in one meridian (direction), in order to make the cornea more spherical (round instead
of oval).
The laser beam will be a certain size
and a certain shape. The point where the laser touches the eye is called a spot. The smaller the spot, the more focused it is, creating a higher intensity beam that moves around the eye at a faster rate. This means the laser only removes the material it needs to, providing a more precise treatment.
What actually happens?
You lie back on a bed and look into a flashing light. In the space of seconds, the laser removes a tiny, precise amount of corneal tissue to alter the optical focusing properties of the eye, by altering the curvature of the cornea.

   50   51   52   53   54