**Question:** A 55 year old cardiac patient who was on long-term treatment comes for follow up visit. The physician observes the following finding on ophthalmological examination. Which drug prescribed by the physician would most probably be responsible for this?

A.
B.
C.
D.

**Core Concept:** Long-term medication use can lead to various side effects, including drug-induced ocular changes. Cardiac medications are a common culprit for such changes due to their systemic effects on the body and their potential to cross the blood-retina barrier.

**Why the Correct Answer is Right:** The correct answer is likely related to the use of calcium channel blockers (CCBs). Calcium channel blockers are medications used to treat hypertension, angina, and heart failure. When administered over an extended period, these drugs can cause a condition known as ocular vasodilation, which results in the dilation of retinal vessels and increased blood flow to the retina. This leads to the observed findings on ophthalmological examination.

**Why Each Wrong Option is Incorrect:**

A. Diuretics: Although diuretics may cause ocular side effects like oedema and papilloedema, they do not typically lead to the observed findings of increased retinal vessel diameter and increased blood flow.

B. Beta-blockers: Beta-blockers are primarily involved in reducing heart rate and blood pressure, and their ocular side effects are generally mild and reversible. The observed findings align more with calcium channel blockers.

C. ACE inhibitors: ACE inhibitors primarily affect the cardiovascular system by reducing blood pressure and preventing angiotensin II-induced vasoconstriction. The specific ocular findings seen here are more consistent with calcium channel blockers.

D. Angiotensin II receptor blockers (ARBs): Similar to ACE inhibitors, ARBs primarily act on the cardiovascular system, not causing the specific ocular findings observed in this scenario.

**Clinical Pearl:** Ocular side effects of medications are not uncommon, and it is essential for doctors to be aware of these side effects when assessing patients for their ocular health. Regular examination of the eyes is crucial for early detection and management of medication-induced ocular changes.