NCLE lab
Fluorescein pattern trainer
A rigid gas permeable lens is on the eye. Call the fit from the pattern alone, then see the K readings and trial lens and decide what to order.
Setting up the slit lamp…
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Reference patterns
Drawn with the same model as the cases: a 9.2 mm lens on a 43.00 D cornea (42.50 D for the toric examples), lens base curve as labelled.
Aligned, on K
Lens on K.
Steep: central pooling
Lens 1.00 D steeper than K.
Flat: central touch
Lens 1.00 D flatter than K.
With-the-rule cornea
Lens on K, 2.25 D corneal cylinder.
Against-the-rule cornea
Lens on K, 2.25 D corneal cylinder.
Flat and riding high
Lens 0.75 D flatter than K.