Eagle eyes

Currently the human eye uses three slightly different types of rhodopsin for colour vision. Other varieties are known among other animals, and could perhaps conceivably be added to expand the human perceptive range (in order to do this, the synthesis pathways must be added and placed near the other genes coding for rhodopsin synthesis and somehow linked to the cone-cell differentiation signals. Not exactly easy, but can be done. This expand the range of colours from the near ultraviolet to the near infrared..

Technically enhanced vision.
Technically enhanced vision.