According to light lesson, if a person's eye lens is elongated he is suffering from Hypermetropia, if lens is flattened he is suffering from Myopia. A person needs bifocal lens if he is suffering from both the diseases at the same time. So, how can a person's eye's lens be elongated and flattened at same time?

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Solution

In general, a person cannot see both long distance and short distance at the same time.

So, elongation and flattening of eye lens won't take place at the same time.

Depending on the type of defect, the eye ball either elongate or flattened as per the situation.

So, there is no chance of both elongation and flattening of eye ball at the same time.

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