[Kinsuemei2]

Reptilians can focus on near and far by squeezing or stretching their lenses, using the ciliary muscles and annular pads. Pupils dilate and contract in response to light. Some Reptilians have a stenopaic pupil that contracts into a vertical slit composed of a linear array of dots. Some have slit pupils, others are round. Reptilians have a choroid body, called the conus papillaris. Projecting out into the vitrious humor, it nourishes the cornea.

the most common species have retinas that contain multicolored oil droplets in their photo receptors, so they can perceive color. The opsin proteins in the cones in the eye are "calibrated" to detect different wavelengths. In many species, this enables them to see into the higher wavelengths beyond the scope of human vision into the UV range.

I have experienced their pupils dilating when they get tense or frustrated.
they tend to slit up when they start to mentally focus.