Question
A patient with a gradual decrease of vision also now coming to you with myopia. What is the most likely cause of his refractory condition.
| A. |
Axial myopia
|
| B. |
Index myopia
|
| C. |
Positional myopia
|
| D. |
Curvatural myopia
|
Show Answer
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Correct Answer � B
Explanation
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|
If a patient presents with a gradual decrease in vision and is diagnosed with myopia, it is important to determine whether the myopia is due to index myopia or another type of myopia, such as axial myopia or curvature myopia.
Index myopia is caused by a refractive error in the cornea and lens of the eye, which results in light focusing in front of the retina instead of on it. This type of myopia can be corrected with glasses or contact lenses that adjust the refractive power of the eye to allow light to focus correctly on the retina.
Axial myopia, on the other hand, is caused by the eyeball being too long, which causes light to focus in front of the retina. This type of myopia can also be corrected with glasses or contact lenses, but may also require additional treatment such as orthokeratology or refractive surgery to reshape the cornea.
Curvature myopia is caused by an abnormal curvature of the cornea, which causes light to focus in front of the retina. This type of myopia can also be corrected with glasses or contact lenses, but may also require additional treatment such as corneal reshaping surgery.
To determine the cause of a patient’s myopia, an eye exam will be necessary. This may include visual acuity testing, a refraction test to measure the eye’s refractive error, and possibly imaging tests such as an ultrasound or optical coherence tomography (OCT) to assess the shape and length of the eyeball.
