Without glasses, everything can be a blur! Here is a "biography" of glasses, an essential invention that helps people see clearly.Ever since someone first noticed that a jar of water magnified what was behind it, people have worked to improve their vision. Glasses is a fun and informative look at an invention that makes a huge difference in our lives. This STEAM nonfiction title is part of the new Eureka! series, each book focusing on one groundbreaking, world-changing discovery that millions of people use every single day.