Necessary that the bowl of the lens is free of preservatives Must be rinsed free of preservatives after storage Bowl of lens is then filled with non-preserved saline Lens insertion Bowl of lens must be completely filled with saline Two to three fingers need to be utilized to balance the lens Modified large DMV for balance Patients head should be parallel to the ground Lens is then placed directly over the cornea Lens removal Place DMV on the lower third of the lens to remove Understand the fitting process Understanding initial lens selection Sagittal depth Increased with greater irregularity Greater sagittal depth with steeper base curve or larger lenses Central clearance is between 100-300um Low clearance Requires increased sagittal depth Steepen base curve Steepen limbal clearance Excessive clearance Requires decreased sagittal depth Flatten base curve Flatten (decrease) limbal clearance Limbal clearance Low clearance Increase sagittal depth Steepen limbal curve Excessive clearance Decrease sagittal depth Flatten limbal curve Scleral landing Alignment Impingement Excessive pressure at the edge of the lens on the conjunctiva May cause vascular blanching Requires scleral landing flattening Compression Excessive pressure at the most central portion of the scleral landing zone
Necessary that the bowl of the lens is free of preservatives Must be rinsed free of preservatives after storage Bowl of lens is then filled with non-preserved saline Lens insertion Bowl of lens must be completely filled with saline Two to three fingers need to be utilized to balance the lens Modified large DMV for balance Patients head should be parallel to the ground Lens is then placed directly over the cornea Lens removal Place DMV on the lower third of the lens to remove Understand the fitting process Understanding initial lens selection Sagittal depth Increased with greater irregularity Greater sagittal depth with steeper base curve or larger lenses Central clearance is between 100-300um Low clearance Requires increased sagittal depth Steepen base curve Steepen limbal clearance Excessive clearance Requires decreased sagittal depth Flatten base curve Flatten (decrease) limbal clearance Limbal clearance Low clearance Increase sagittal depth Steepen limbal curve Excessive clearance Decrease sagittal depth Flatten limbal curve Scleral landing Alignment Impingement Excessive pressure at the edge of the lens on the conjunctiva May cause vascular blanching Requires scleral landing flattening Compression Excessive pressure at the most central portion of the scleral landing zone