This makes plenty of sense from a programming prospective; you probably multiply the angle for the field of view by the modifier. If you usually see in a 120 degree arc in front of you projected onto the monitor, Telescope would do 120 * 0.55 = 66 degrees, which is a smaller area so things get larger and you see a narrower area. Assiduous vision would then do the opposite.
This is consistent with how they implemented slows and haste as well. Togor's Insects is spell effect 11 capped at 30, while Speed of the Shissar is spell effect 11 set to 166. Its a % of original attack speed modification stat. Lucy helpfully splits it into slow and haste and inverts the slow, but if you look at the spell effects file its the same effect type.
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