glumshoe Legolas's pupil size isn'tthe problem here, though. 5 leagues is 17.262 miles. The curvature of the Earth means that for a person of average height, the visual horizon is less than three miles away. Even if your vision is telescopic and the atmosphere is perfectly clear, you can't see around the planet. If they were standing on a hill, it would have to be at LEAST 198 feet above sea level in orderto see the horizon at 17.2 miles away, with nothing tal in between. Which, knowing Rohan, isn' impossible. But consider. Elven satellite eyeballs [drawing of Legolas with eyestalks
https://s3.masto.ai/media_attachments/files/109/432/669/037/878/090/original/3275dc21377c992d.png