What would happen to a vision if the lens as unable change shape?

If the lens were unable to change shape, it would result in a condition called fixed focus or loss of accommodation. The lens is a flexible structure in the eye that changes its shape to focus light onto the retina, which is necessary for clear vision at different distances. Without the ability to change shape, the lens would be unable to adjust the focal length of the eye, leading to blurred vision for both near and distant objects.

Nearsightedness (Myopia): The inability of the lens to flatten would result in nearsightedness. Distant objects would appear blurry, while nearby objects would be seen clearly. This occurs because the fixed-shaped lens would cause light rays to converge in front of the retina instead of directly on it.

远视 (Hyperopia): Conversely, if the lens could not become rounder, hyperopia or farsightedness would occur. This condition makes it difficult to see nearby objects clearly, while distant objects may appear sharper. In this case, light rays would be focused behind the retina due to the fixed lens shape.

Individuals with this condition may experience various symptoms such as eyestrain, headaches, and difficulty seeing at certain distances. Corrective measures like eyeglasses or contact lenses with the appropriate prescription can compensate for the fixed lens and restore clear vision. In some cases, surgical interventions might be necessary to correct the issue permanently.