Types of EDOF
• Small aperture EDOF 
Small aperture increases depth of focus and depth of field due to its pinhole effect
• Diffractive EDOF 
Aspheric anterior surface and a posterior diffractive surface with a echelette design that 
creates a diffractive pattern that also elongates a single focal point
• Beam-shaping extended depth-of-focus (EDOF)
Changing the geometry of the central optical area, causing a change in the power from 
center to periphery, either increasing the central power of the lens or elongation of the 
focus by a wavefront modulation effect
Internal Skill Enhancement Series 4