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â¢ People ages 20 to 40 should have an eye exam at least every five years unless there are vision changes, pain, flashes of light, new floaters, injury or tearing. Immediate care is needed to address any of those symptoms.
A comprehensive eye exam can take an hour or more, depending on the doctor and the number and complexity of tests required to fully evaluate your vision and the health of your eyes.etinoscopy. Your eye doctor may perform this test early in the eye exam to obtain an approximation of your eyeglass prescription. In retinoscopy, the room lights will be dimmed and you will be given a large target (usually the big E on the chart) to fixate on.