Clairvoyance (千里眼, Senrigan?, lit. "Thousand-LiWP Eyes") is a visual ability that is also called Hawkeye. This is generally a must-have ability of the Archer class. It is also frequently used during scouting. Simply looking from a high location is sufficient to fully survey a town and search for enemies. In addition, Clairvoyance will affect the accuracy of bows. It connotes superior visual perception and dynamic occipital capture, such as to supplement the long-range aiming of projectile weapons. At higher ranks, it is possible that the bearers of this Skill have acquired abilities such as precognition ("future vision") and other forms of perception beyond standard eyesight (X-ray vision and so forth) - this is also considered a prerequisite for being a Grand Caster. It is a Skill furnished on the flesh.[1][2][3]
While Clairvoyance mostly allows the user to see the past or the future, Merlin's clairvoyance allows him to see everything that happens in the present.
Also, Arjuna has the possibility of seeing invisible targets. By extremely concentrating during the moment he shoots the bow, he manipulates his own sense of time.[8]
Able to precisely snipe even enemies moving at high speeds as long as they are within a 4km range. EMIYA acquires this by applying Reinforcement to his eyes.[1]
↑Fate/Grand Order Profiles of Mordred, Nikola Tesla, Arturia Pendragon (Alter) (Lancer), Paracelsus, Charles Babbage, Jekyll & Hyde, Frankenstein, Solomon, Arjuna and Karna, translated by Master of Chaos at Beast's Lair.