Mrs. Agos has likely suffered damage to her visual memory.
Step-by-step explanation:
Mrs Agos has lost the sense of visual memory in the sense that she no longer recognizes the sights that she was used to see in her life and has not been able to recall even her husband from sight when she sees him right in front of her.
She is able to recognize him from his voice which means her auditory memory is fine and also that she does remember her husband which means that the memory itself is intact but the memory from the visual sense has been lost for her.