Roenne nasal step

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Roenne,

Henning K.T., Danish ophthalmologist, 1878-1947.
Roenne nasal step - a visual field defect seen in glaucoma.

Roenne nasal step 

When scotomata occur above and below the fixation point they meet in the nasal field and form a horizontal step-like defect. It is one of the signs of glaucoma. See Bjerrum's scotoma.
References in periodicals archive ?
a Arcuate and nasal step defects are characteristic of this condition
It is an inferior nasal step defect with an inferior paracentral scotoma defect
c) Right nasal step defect, commonly associated with primary open angle glaucoma