Eventually vision is affected and the patient is only able to see if light is present.

The correct answer is C. ultimately.

The

word “ultimately” means “in the end” or “finally”. In the context of the question, it means that the patient’s vision will eventually be affected, and they will only be able to see if light is present.

The other options are incorrect because they do not accurately reflect the meaning of the question. The word “initially” means “at the beginning” or “at first”. The word “primarily” means “most importantly” or “chiefly”. The word “gradually” means “slowly and steadily”.

In the context of the question, it is not accurate to say that the patient’s vision is initially affected, or that it is primarily affected, or that it is gradually affected. The correct answer is that the patient’s vision is ultimately affected.