Refer to the above image and answer the following questions.

a. What is this imaging?

b. What is the diagnosis?

a
Answer a
Wavefront analysis.
Wavefront analysis uses the fact that light travels in flat sheets 
called wavefronts. The irregularities or aberrations in the cornea 
and the lens of  the eye changes the light waves and create 
wavefront  errors or distortions, as the light rays enter and exit the eye. 
The wavefront analyzer aims light rays from a single laser beam into the eye and focuses them on the retina. As they are reflected back out from the retina these light rays are subjected to possible aberrations as they travel through the eye's optics. If the eye has no irregularities these light rays will come out of the eye in a plane wavefront, or a straight line.
 However, if the eye has irregularities, also called higher order aberrations, the wavefront emerges not in a straight line, but with a unique shape specific for that eye. 
 

Answer b
The patient has a regular astigmatism. The result of the test is shown in three-dimensionally.