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Ophthalmology is a wonderful field, and if it's something you are interested in, you should definitely take time during undergrad to learn more about the field, and shadow someone if you have the chance.
That being said, I encourage you to keep up with the basic sciences during undergrad. Correct me if I'm wrong, but I assume you are talking about your classes in the basic sciences. Those will be very important in getting into medical school. Plus you will need to take anatomy, physiology, biochemistry, and histology in medical school, so having a strong foundation will help you in your med school coursework and your path to becoming an ophthalmologist.