Uncovering the Flaws in Huygens' Telescopes.
Christiaan Huygens, a 17th-century mathematician and astronomer, built telescopes that were considered poor in quality for the period. Now, it is believed that Huygens may have needed corrective glasses all along, as he may have been nearsighted. This would account for why his telescopes were blurry, despite his calculations for different magnification levels. Huygens is known for discovering Titan, the largest moon of Saturn, and studying the planet's rings.