When a person has significant blockage of the heart arteries it will result in reduced body energy.will the blockage also affect memory and eyesight?

Not really: Significant coronary artery disease will give you chest pain, short of breath and weakness. But unlikely to affect your memory or vision.

May be: Significant blockage will result in an inability to be active due to reduce performance of your heart pumping o2 blood to all your body. May be even causing heart failure. If that happen, in theory, your memory could suffer. Not sure about your sight. I will advice to get a good eye specialist to check your eyes. Also check with your primary care doctor to r/o other causes of memory loss.