Dioptric
/daɪˈɑːptrɪk/
Definition 1 of 2
Pro Tip 1/3Optics Specific
Term often used in physics and engineering related to lenses and light. 
He's designing a dioptric telescope for better star observation.
Pro Tip 2/3Not for Color
Dioptric refers to light bending, not color changes or intensity. 
Dioptric filters don't affect the hue, just the focus.
Pro Tip 3/3Avoid in Casual
Use 'lens' or 'focus' in everyday conversation unless you're talking with specialists. 
Her camera has excellent focus, rather than saying it has a great dioptric lens.