Which condition is characterized by the eye being unable to focus on near objects?

The condition characterized by the eye being unable to focus on near objects is hyperopia, also known as farsightedness. In hyperopia, light entering the eye is focused behind the retina rather than directly on it. This results in difficulty with near vision, making it hard for individuals to read or perform tasks that require seeing up close. The eye's inability to clearly focus on nearby objects can lead to strain, discomfort, and visual fatigue, especially during activities that demand close vision.

In contrast, the other conditions affect vision differently. Myopia, or nearsightedness, makes it challenging to see distant objects clearly. Astigmatism results from an irregular curvature of the cornea or lens, leading to distorted or blurred vision at all distances. Anisometropia involves a significant difference in refractive power between the two eyes, which can lead to challenges with binocularity and depth perception. Each of these conditions presents unique visual challenges, but in the case of difficulty focusing on near objects, hyperopia is the correct and relevant condition.