[.ca] An Introduction to Hamiltonian Optics (ISBN 0486675971)

Analytical methods:
This book is by far the best in the field of geometrical optics dealing with 3-d, 5-th and higher orders aberrations in symmetric optical system. The language is very clear and easy to follow, it is written for a broad audience. I would personally recommend it for all how has an interest in the theory of optical aberrations.