Whether 1.59 lenses are worth it depends on your specific needs and circumstances. They can be an excellent choice for many people, particularly those who: Have stronger prescriptions (generally above ±4.00) Lead active lifestyles or play sports Need highly impact-resistant lenses (like children or those in certain professions) Want built-in UV protection Prefer thinner and lighter lenses The main drawback of 1.59 lenses is their higher cost compared to 1.5 index lenses. However, many people find that the benefits outweigh the additional expense. If you have a mild prescription, don't engage in activities that put your glasses at risk of impact, and are on a tight budget, you might find that 1.5 index lenses serve your needs just as well at a lower cost. Ultimately, the value of 1.59 lenses comes down to your personal priorities and how much you're willing to invest in your eyewear.