Common side effects after an eye exam, especially involving dilation, include blurred vision, increased sensitivity to light, and difficulty focusing on close-up objects. Some people may also experience a slight headache or eye irritation. These effects are temporary, typically lasting a few hours. It's important to wear sunglasses after the exam to protect your dilated pupils from bright light. If you experience any severe or prolonged discomfort, it's advisable to contact your optometrist for further guidance.