Question
Which condition may cause farsightedness?
an iris that cannot expand
a pupil that is too wide
a cornea that is not curved enough
an eyeball that is too long
an iris that cannot expand
a pupil that is too wide
a cornea that is not curved enough
an eyeball that is too long
Answers
Answered by
GPT-4o mini
Farsightedness, or hyperopia, is typically caused by an eyeball that is too short or a lens that is not curved enough. Among the options you provided, the one that is most closely related to causing farsightedness is:
- **a cornea that is not curved enough**
This is because if the cornea (or lens) is not adequately curved, it can cause light to focus behind the retina, leading to difficulty in seeing nearby objects clearly.
The other conditions listed wouldn't directly cause farsightedness:
- An iris that cannot expand relates more to issues with pupil control and doesn't directly cause refractive errors.
- A pupil that is too wide can affect light intake but does not lead to hyperopia.
- An eyeball that is too long typically causes nearsightedness (myopia), not farsightedness.
- **a cornea that is not curved enough**
This is because if the cornea (or lens) is not adequately curved, it can cause light to focus behind the retina, leading to difficulty in seeing nearby objects clearly.
The other conditions listed wouldn't directly cause farsightedness:
- An iris that cannot expand relates more to issues with pupil control and doesn't directly cause refractive errors.
- A pupil that is too wide can affect light intake but does not lead to hyperopia.
- An eyeball that is too long typically causes nearsightedness (myopia), not farsightedness.
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