Objectives: At the conclusion of this conference the resident will have an understanding of the principles of contact lens optics and will be able to solve optics problems that involve

• Vertex distance conversions: 
  • ability to ray trace vertex distance conversions
  • ability to calculate far points and changes in far points related to lens placement
  • ability to calculate, describe and compare vertex distance conversions with plus and minus lenses
• Lens effectivity
  • ability to calculate, describe and compare lens effectivity with plus and minus lenses
• Accommodation
  • knowledge of basic definitions
  • ability to calculate and ray trace accommodative problems/scenarios

Reading Assignment: Please read David Guyton's Ophthalmic Optics and Clinical Refraction pages 24 -28