The human diencephalon is composed of several regions. The thalamus which relays sensory information to the cerebrum, processes visual and auditory stimuli, and generates some emotions, among other functions.he human diencephalon is composed of several regions. The thalamus which relays sensory information to the cerebrum, processes visual and auditory stimuli, and generates some emotions, among other functions.
The LASIK surgery is performed by an ophthalmologist who uses a laser or microkeratome to reshape the eye's cornea in order to improve visual acuity. For most patients, LASIK provides a permanent alternative to eyeglasses or contact lenses.
There are two main parts of LASIK surgery: 1. Creation of corneal flap. 2. Laser below the flap on corneal stroma bed to rectify the refractive error. For the first part either a blade (microtome) is used or specialised laser called âfemtosecond laserâ is used. With the laser, the cut is more precise and under direct visualisation, unlike with a blade, and hence more safe.