Light rays are refracted by the cornea and lens to focus an inverted image onto the retina.
The human eye is a masterpiece of biological engineering. Standard anatomy books often give it a chapter or two. Khurana’s book, however, dedicates an entire volume to the subject, offering depth that general textbooks cannot match.
The book is available in multiple editions, with recent versions featuring enhanced diagrams and clinical updates:
If you have the 7th Edition: Khurana, A. K., & Khurana, I. (2019). Anatomy and Physiology of the Eye. In Comprehensive Ophthalmology (7th ed.). Jaypee Brothers Medical Publishers.