The point of this question, although related in subject to optometry, is not so much in the answer you deliver but in how you process it in real-time in front of your interviewer. Any time you answer a brainteaser question, riddle, or puzzle in an interview, you want to answer as follows;
Carefully consider the question, spending a moment to process it before blurting out an answer. Ask questions to ensure you have all the information you need to proceed intelligently. Think it through out loud, so your interviewer can see how you approach such complicated scenarios. That will display your resourcefulness and creativity when problem-solving. A common approach is to appeal to the other senses a blind person does possess, such as touch, emotions, smell, and taste. But the extra step would be to portray a sensitive bedside manner while remaining sunny and positive.
