The lenses are the most critical parts of eye glasses, as they correct vision problems such as nearsightedness, farsightedness, astigmatism, and presbyopia. Optical-grade lenses are recommended based on prescriptions provided by optometrists. Specialized lenses, such as polarized lenses for reducing glare or photochromic lenses that adapt to light conditions, cater to specific needs. Anti-reflective coatings and blue-light-blocking technologies enhance visual clarity and protect against digital screen exposure.