Pupillary distance, in simple terms, is the distance between the pupils of the two eyes. When normal people look at the same object with both eyes, the object is imaged on the retinas of both eyes respectively and overlapped in the visual center of the brain to form a complete, three - dimensional single object. This function is called binocular single vision. However, during the formation of binocular single vision in infants and young children, it is very easy to be affected by external factors, causing one eye to focus on the target while the other eye deviates and cannot look at the same target, thus leading to strabismus. In medicine, when the eyeball turns inward when looking at an object, it is called esotropia, which is commonly known as "cross - eyed".
Have you ever dreamed of witnessing a solar eclipse but worried about the cost of those fancy eclipse glasses? Or perhaps you're a DIY enthusiast itching to create something unique while still ensuring your eye safety during this celestial event? Well, you're in luck! Making your own eclipse glasses is not only a fun and rewarding project but also a practical way to get up - close and personal with the wonders of the universe. Let's roll up our sleeves and get started!
Materials You'll Need
Solar - filter material: This is the star of the show. You can find aluminized Mylar film, which is super thin and shiny. It's like a magic shield that blocks out over 99.99% of the
