By examining their eyeballs. The field of vision is determined by where the eyes are located and where they can rotate, visual acuity is dependent on the lens shape and how dense the light receptors are, you can tell what colours an animal can see by the kinds of light sensitive cells they have in the eyes, etc.
By examining their eyeballs. The field of vision is determined by where the eyes are located and where they can rotate, visual acuity is dependent on the lens shape and how dense the light receptors are, you can tell what colours an animal can see by the kinds of light sensitive cells they have in the eyes, etc.