A 30-year-old man has 6/5 vision each eye, unaided. His cycloplegic retinoscopy is + 0.0D sph. at 1 metre distance. His complaints are blurring of newsprint at 30 cm, that clears up in about two minutes. The most probable diagnosis is –
**Core Concept**
The patient's symptoms suggest an accommodative or convergence insufficiency, which is a condition where the eye muscles have difficulty focusing on close objects due to an imbalance in the extraocular muscle function. This condition is often associated with symptoms such as blurred vision, headaches, and eye strain, particularly when performing tasks that require prolonged near vision.
**Why the Correct Answer is Right**
The patient's complaint of blurring of newsprint at 30 cm that clears up in about two minutes is a classic symptom of accommodative or convergence insufficiency. The cycloplegic retinoscopy result of + 0.0D sph at 1 meter distance indicates that the patient's refractive error is minimal, ruling out refractive errors as the cause of his symptoms. The patient's unaided vision of 6/5 in each eye suggests that his visual acuity is excellent, making it unlikely that his symptoms are due to a refractive error or other visual acuity issues.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect as it does not directly relate to the patient's symptoms or the cycloplegic retinoscopy results.
**Option B:** This option may be a distractor, but it's not directly related to the patient's symptoms of blurred vision that clears up in about two minutes.
**Option C:** This option is incorrect as it does not address the patient's symptoms of accommodative or convergence insufficiency.
**Clinical Pearl / High-Yield Fact**
A key aspect of diagnosing accommodative or convergence insufficiency is to rule out refractive errors as the cause of symptoms. Cycloplegic retinoscopy is a useful tool in this regard, as it can help determine whether the patient's symptoms are due to an underlying refractive error or other factors.
**Correct Answer: A. Accommodative Convergence Insufficiency**