Which of the following is NOT a known ocular side effect associated with Sildenafil (Viagra)?

Which of the following is NOT a known ocular side effect associated with Sildenafil (Viagra)?

• A. NAION
• B. PSC cataract formation
• C. Photosensitivity
• D. Cyanopsia

Answer: (B)

Sildenafil’s ocular effects come from how it interacts with the eye’s photoreceptor pathways. The drug inhibits PDE5, but it also inhibits PDE6 in the retina, which can disrupt normal phototransduction. This often manifests as color-vision changes, most classically a blue-tinted or cyan-tinged vision (cyanopsia), and it can be accompanied by photosensitivity in some users. There are rare reports of non-arteritic anterior ischemic optic neuropathy (NAION) after sildenafil use, though proving a direct causal link is challenging and these cases usually involve other vascular risk factors. Posterior subcapsular cataract (PSC) formation, on the other hand, is a lens issue linked to factors like aging, steroid use, radiation, or metabolic disease. Sildenafil doesn’t have a mechanism that targets lens changes to produce PSC cataracts, so PSC cataract formation is not considered a known ocular side effect of this medication. Therefore, PSC cataract formation stands out as not being a recognized ocular adverse effect of sildenafil, even though the drug can affect color vision, light sensitivity, and, in rare cases, optic nerve health.

Sildenafil’s ocular effects come from how it interacts with the eye’s photoreceptor pathways. The drug inhibits PDE5, but it also inhibits PDE6 in the retina, which can disrupt normal phototransduction. This often manifests as color-vision changes, most classically a blue-tinted or cyan-tinged vision (cyanopsia), and it can be accompanied by photosensitivity in some users. There are rare reports of non-arteritic anterior ischemic optic neuropathy (NAION) after sildenafil use, though proving a direct causal link is challenging and these cases usually involve other vascular risk factors.

Posterior subcapsular cataract (PSC) formation, on the other hand, is a lens issue linked to factors like aging, steroid use, radiation, or metabolic disease. Sildenafil doesn’t have a mechanism that targets lens changes to produce PSC cataracts, so PSC cataract formation is not considered a known ocular side effect of this medication.

Therefore, PSC cataract formation stands out as not being a recognized ocular adverse effect of sildenafil, even though the drug can affect color vision, light sensitivity, and, in rare cases, optic nerve health.