**Core Concept**
Accommodative lag is a condition where the ciliary muscles of the eye fail to relax and allow the lens to return to its normal shape after focusing on a near object. This results in sustained convergence and an inability to relax, leading to blurred vision.

**Why the Correct Answer is Right**
The patient has 6/5 vision unaided, indicating no significant refractive error. However, the cycloplegic retinoscopy shows +1.0 D sph. at 1 metre distance, suggesting a latent hyperopic component. The patient's complaints of blurring of newsprint at 30 cm that clears up in about 2 minutes are classic symptoms of accommodative lag. This condition occurs due to the ciliary muscles' inability to relax and allow the lens to return to its normal shape after focusing on a near object. As a result, the patient experiences blurred vision at near distances, which resolves once the accommodative effort is released.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not address the patient's symptoms of accommodative lag.
* **Option B:** This option is incorrect as it suggests a refractive error that is not supported by the cycloplegic retinoscopy results.
* **Option C:** This option is incorrect as it implies a problem with the patient's convergence, which is not directly related to the patient's symptoms of accommodative lag.

**Clinical Pearl / High-Yield Fact**
Accommodative lag can be a subtle condition that can be easily missed in clinical practice. It is essential to perform cycloplegic retinoscopy to diagnose latent refractive errors and to assess the patient's accommodative function.

**Correct Answer:** C. Accommodative lag.