Sector or arcuate defects, left eye

This code signifies a visual field defect characterized by a wedge-shaped or arc-shaped area of vision loss in the left eye. These defects typically arise from damage to the retinal nerve fiber layer or optic nerve, often respecting the horizontal meridian.

Apply this code when documentation specifies a sector or arcuate visual field defect affecting the patient's left eye. This diagnosis is commonly made following perimetry testing (e.g., Humphrey visual field test) and supported by ophthalmological examination findings.

• Ensure laterality is accurately documented and coded; this code is specific to the left eye.
• Distinguish from other visual field defects like generalized constriction or quadrantanopia.
• Always code the underlying cause of the visual field defect (e.g., glaucoma, optic neuropathy) first, if known.