Sunglasses aren’t just ideal tools for completing outfits. Apart from being great fashion accessories, the right pair of shades also provides excellent protection against glare, ultraviolet (UV) rays, and everyday physical hazards. One thing to keep in mind, however, is that not all kinds are created equal. Knowing what type of sunglasses to look for—and what defence they offer—is critical to making your next purchase.

Though I knew that the recovery from LASIK is usually quick and virtually painless, I was still nervous when I went in for my procedure.

According to a long-term research study from the University of Copenhagen, it’s likely that anyone with blue eyes shares a common ancestor. While variation in human eye colour is caused by at least 15 separate genes, mutation in a single gene produces blue, and can be traced to a specific DNA location.

The first LASIK corrective procedure took place in 1992, though the treatment can trace its roots back much farther: to the development of keratomileusis in the 1960s, and the evolution of photorefractive keratectomy (PRK) in the 1970s. Combined, these technologies paved the way for the modern Advanced Custom Wavefront LASIK and All-Laser LASIK procedures.

Eye shapes play a crucial role in vision. The eye works by focusing light as it passes through the cornea and the crystalline lens. The light travels through the vitreous humour, a clear gel filling the inside of the eye, and hits the retina at the back of the eye.