Abnormal dark adaptation curve

This code signifies an abnormal result from a dark adaptometry test, indicating impaired scotopic vision or night blindness. It points to a dysfunction in the eye's ability to adjust to low-light conditions, often due to retinal photoreceptor issues.

Apply this code when documentation explicitly states an "abnormal dark adaptation curve" or "impaired dark adaptation" following diagnostic testing. This is typically used in cases investigating night vision complaints or suspected retinal dystrophies.

• Ensure the medical record clearly documents the performance and abnormal finding of a dark adaptometry test.
• Do not confuse this with subjective complaints of night blindness (H53.60) unless an objective test confirms the abnormality.
• Sequence this code after the underlying cause of the abnormal dark adaptation curve, if known and documented (e.g., retinitis pigmentosa).