The lens of an individual's eyes curves to focus on objects. By adjusting the amount of light that's hitting their retina, individuals can focus on things both near and far away from them. However, the majority of individuals have an imperfectly shaped cornea. This means the light is focused directly in front of or behind the retina instead of on it, which leads to blurring. If patients are experiencing sudden difficulty focusing or blurring in their vision, they should schedule an eye exam. Some individuals have inconsistent problems with focus, and rather than everything being blurry, patients might notice they only have vision issues when they try to look at details in certain objects. Another example would be individuals who have trouble focusing on objects in light, but don't struggle at night, or individuals who have focus issues that seem to move between eyes. Even if the problems don't impair a patient's day-to-day life, they should still schedule an exam to rule out potentially serious eye issues.
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