1. Digoxin

   • Classic visual change: Yellow-green vision (xanthopsia), halos around lights.
   • Important because digoxin toxicity and its signs are frequently tested.

2. Hydroxychloroquine / Chloroquine

   • Classic toxicity: Retinopathy causing irreversible vision loss in chronic use.
   • Important for its classic adverse effect in clinical vignettes.

3. Ethambutol

   • Classic toxicity: Optic neuropathy leading to decreased visual acuity and color vision loss (red-green color blindness).
   • Important because of its link with tuberculosis treatment and vision loss.

4. Topiramate

   • Can cause acute myopia and angle-closure glaucoma.
   • Increasingly encountered and thus high-yield.

5. Isotretinoin

   • Can cause decreased night vision and dry eyes.
   • Known teratogen and has ocular toxicity.

6. Sildenafil (PDE5 inhibitors)

   • Blue tint to vision due to inhibition of PDE6 in retina.
   • Commonly tested in physiology and adverse effects.

7. Corticosteroids (long-term use)

   • Can cause cataracts and glaucoma.
   • Common medications with important ocular side effects.