query: Why are eye defects so common?
positive_passages.docid: 18753
positive_passages.text: Bad Eyesight and Evolution
negative_passages.docid: 20470
negative_passages.text: Why do different humans look different?
negative_passages.docid: 54757
negative_passages.text: Why is the light reflected at the same angle from mirror?
negative_passages.docid: 73811
negative_passages.text: How can I protect my eyesight when using computers?
negative_passages.docid: 10496
negative_passages.text: Why do covalent bonds form?
negative_passages.docid: 140996
negative_passages.text: Are there naturally occurring lasers?
negative_passages.docid: 44625
negative_passages.text: Is it normal to get hundreds of break-in attempts per day?
negative_passages.docid: 104999
negative_passages.text: The dark dot in your eye
negative_passages.docid: 35772
negative_passages.text: Is it possible to duplicate eyes?
negative_passages.docid: 152159
negative_passages.text: How do our eyes detect light at different frequencies?
negative_passages.docid: 138097
negative_passages.text: What's the reason for red eye in photo?
negative_passages.docid: 91692
negative_passages.text: Do laser beams interfere noticeably with each other?
negative_passages.docid: 105250
negative_passages.text: Does anyone actually wear eyeglasses in Star Wars?
negative_passages.docid: 123662
negative_passages.text: Ubuntu eye strain problem?
negative_passages.docid: 43047
negative_passages.text: Why do some lenses cost 10 times as much when the specs are very close?
negative_passages.docid: 104989
negative_passages.text: What causes refraction of visible light?
negative_passages.docid: 46899
negative_passages.text: Why are light rays able to cross each other?