With the development of science and technology, our life is becoming better and richer. However, the fact is that more disease happen on us because of the less excerise. Having a cold is the common one which leads to a series of bad systems. Such as blocked ears, blurred vision, dizziness and so on. For your question, I say "Yes" that blocked ears is possible to cause blurred vision. The symptoms of blocked ears could be due to the blockage of the Eustachian tube which is the tube connecting nose and the ear. The blurred vision is due to the congestion in the ethmoidal sinuses. Luckily, the condition will be improved by the following ways: 1. Clean your ear with little bromhexine to reduce the viscosity of the mucus. Drink more warm water to make your nose and throat connected well. 2. Avoid the smoking, drink, or other irritating things. 3. Use saline nasal spray followed by steam inhalation 2-3 times a day, which helps in reducing the nasal congestion. May these ways will help you.