New this month Factual error: The lab technician tells Dr. Powell that Prot is sensitive to ultraviolet light, and says "he can detect light up to 300 to 400 angstroms." Normal human vision is considered to be about 390 to 700 nanometers, which is 3900 to 7000 angstroms. The highest light frequency that an animal is known to be able to see is about 280 nanometers, or 2800 angstroms, so he is saying Prot can see a frequency about 10 times higher than any known animal. 300 angstroms isn't just ultraviolet, it is bordering on X-ray. Prot wouldn't just be unusual, he would be a medical marvel demanding worldwide research for his visual range alone.