Metro Optics Blog

Archive for the ‘Keratoconus’ Category

This patient was brought in by local practitioner for keratoconus fitting with ComfortKone. Topography confirmed keratoconus OU and trial lenses were selected according to Steepest “SimK Values”.

Topography OD

Topography OS

OD – Base Curve 6.60, Power -5.00, Diameter 8.5, A-Value 10

OS – Base Curve 6.30, Power -8.00, Diameter 8.5, A-Value 15

Evaluation showed mild central pool with a thin band of fluorescein around edges OU. Less edge clearance was noted on OS versus OD.

Fluorescein pattern OD

Fluorescein pattern OS

Conclusions:  Base Curve fit is acceptable OU.

More edge lift is needed so higher A Values should be used.

Over-refraction was -.50 OD and -.75 OS.

Prescriptive lens specifications:

OD – Base Curve 6.60, Power -5.50, Diameter 8.5, A-Value 12

OS – Base Curve 6.30, Power -8.75, Diameter 8.5, A-Value 16