A 26 years old male being treated for glaucoma received drug’ A. Patient complains of burning sensation in eye, blurring of vision and dryness of eye. Examination confirmed corneal hypoesthesia. No complaints of headache, nausea, vomiting, and sweating. He has probably been treated with:
**Core Concept**
The patient's symptoms suggest an adverse effect of a medication used to treat glaucoma, likely related to its mechanism of action on the autonomic nervous system, specifically affecting the parasympathetic innervation of the eye.
**Why the Correct Answer is Right**
The patient's symptoms of burning sensation in the eye, blurring of vision, dryness of the eye, and corneal hypoesthesia are consistent with the side effects of a medication that reduces parasympathetic outflow, such as an anticholinergic or antimuscarinic agent. This class of drugs inhibits the action of acetylcholine at muscarinic receptors in the eye, leading to decreased tear production and pupil dilation, which can cause the observed symptoms. The lack of systemic symptoms such as headache, nausea, vomiting, and sweating suggests a localized effect.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not directly relate to the symptoms described. While some glaucoma medications can cause systemic side effects, the patient's symptoms suggest a more localized effect.
**Option B:** This option is incorrect because it is not a common side effect of medications used to treat glaucoma. The patient's symptoms do not suggest an allergic reaction or an autoimmune disorder.
**Option C:** This option is incorrect because it is not a medication used to treat glaucoma. The patient's symptoms and treatment context suggest a medication specifically used for glaucoma.
**Option D:** This option is incorrect because it is not a medication used to treat glaucoma. The patient's symptoms and treatment context suggest a medication specifically used for glaucoma.
**Clinical Pearl / High-Yield Fact**
The patient's symptoms highlight the importance of monitoring for local side effects when using medications that affect parasympathetic outflow in the eye. This includes careful assessment of tear production, pupil reactivity, and corneal sensation.
**Correct Answer:** B. Timolol (a beta-blocker)