Ibn al Haytham was a Muslim innovator born in 965 in Basra. He is also known as Alhazen and The First Scientist. In his time, Alhazen was able to invent the first pinhole camera and a camera obscura. Before Alhazen, scientists thought they didn't have to scientifically prove their findings, but he knew better. Each experiment or hypothesis proposed by Alhazen, he submitted to a physical test and/or proof using mathematical equations. ("Arab Inventors") During his extensive studies of optics, Alhazen was the first to challenge the Greek theory of how light exits the eye and to refute it by proving how light bounces off an object and enters our eye. To prove this, he studied the eye works themselves using the knowledge of previous researchers and dissection. Through this, he began to explain how light enters the eye, is focused and then projected toward the back of the eye, where the image will be inverted. With this knowledge, he was able to study the pinhole camera, which is one of his inventions. His pinhole concept is simple: a box with a small hole on one side is able to project an image of what's outside onto one side of the box inside. Thanks to his studies, particularly after the translation of Kitâb al-Manâzir (The Book of Optics), many scholars and scientists were inspired by him. Later European scholars were able to use what he discovered and expand our knowledge of cameras and optics in general. Alhazen's creation of the pinhole camera is why cameras and other important inventions were created, such as glasses, magnifying glasses, and telescopes, because scholars and scientists knew how images are reflected in our eyes. He particularly influenced Isaac Ne...... middle of paper ...... God is the cause of all things, not astronomical bodies. In his time, Alhazen wrote about 200 books, but since he lived a long time ago and it was not yet known how to preserve the books, only about fifty have survived to this day. In conclusion, in his time, Alhazen invented two things: the obscura camera and a pinhole camera. However, he is best known for having written his book “Kitâb al-Manâzir” which, once translated into Latin, is The Book of Optics. In this book he discussed his study of optics and the eye. Specifically, he explained that light does not come out of our eyes, which is what the Greeks believed. He then explained how sunlight bounces off objects and enters our eyes. In the eye, it is then focused and goes to the back of our eye, where it is returned. His work was always supported by physical tests and mathematical proofs.