Marks will be applied equally to each of (a) and (b).
(a) Before the 1970s, ophthalmologists had to use traditional light sources (e.g. xenon-arc incandescent light source) for retinal photocoagulation. Now they use lasers.
Compare the two technologies, discussing the advantages / disadvantages of each.
(b) Discuss three different types of laser currently used in ophthalmology, providing information about the physical properties of each one and explaining precisely why that particular laser is clinically necessary / useful.

6pgs

use Vancouver referencing style for the article 6 pages