From the Guidelines
Yes, certain medications and supplements can cause blurred vision as a side effect, with anticholinergics being a notable example due to their ability to block muscarinic receptors and cause blurring of vision, among other side effects. According to the study published in 2020 1, centrally acting anticholinergic drugs such as scopolamine and atropine can suppress acute vertigo attacks but may cause blurred vision, dry mouth, dilated pupils, urinary retention, and sedation. Another study from 2021 1 also mentions that anticholinergics, as well as drugs with adrenergic effects, can cause ciliary body edema and angle narrowing, leading to blurred vision. Some key points to consider include:
- Anticholinergics can cause blurred vision due to their effects on muscarinic receptors
- Other medications such as sulfonamides, topiramate, and phenothiazines may also contribute to blurred vision
- It is essential to review a patient's medication history and family history to identify potential causes of blurred vision
- If blurred vision occurs after starting a new medication or supplement, it is crucial to consult a healthcare provider promptly to determine the best course of action.
From the Research
Ocular Adverse Effects of Drugs and Supplements
- Various drugs and supplements can cause blurred vision and other ocular adverse effects, as reported in several studies 2, 3, 4, 5, 6
- Psychotropic medications, such as tricyclic antidepressants (TCAs), typical antipsychotics, and selective serotonin reuptake inhibitors (SSRIs), can induce numerous and diverse unwanted ocular effects, including blurred vision, mydriasis, and angle-closure glaucoma 2
- Herbal medicines and nutritional supplements, such as canthaxanthine, chamomile, and Ginkgo biloba, can also cause ocular side effects, including blurred vision and visual impairment 4
- Illicit drugs and substances of abuse can lead to damage to structures throughout the eye, including corneal conditions, glaucoma, and optic neuropathies 5
- Statins, a class of medication indicated for atherosclerotic diseases and dyslipidemia, can cause ocular disorders, including blurred vision, visual impairment, and reduced visual acuity 6
Specific Drugs and Supplements Associated with Blurred Vision
- Tricyclic antidepressants (TCAs) can cause transient blurred vision in up to one-third of patients 2
- Atorvastatin, a type of statin, has been associated with a higher incidence of ocular side effects, including blurred vision and visual impairment 6
- Canthaxanthine, a herbal medicine, has been reported to cause ocular side effects, including blurred vision and visual impairment 4
- Ginkgo biloba, a herbal supplement, has been associated with ocular side effects, including blurred vision and visual impairment 4
Importance of Monitoring and Reporting Ocular Adverse Effects
- Monitoring for ocular toxicity and reporting adverse events are crucial in reducing the risk of visual loss and identifying potential ocular side effects of drugs and supplements 3, 4, 5, 6
- Clinicians, including psychiatrists, ophthalmologists, and primary care physicians, need to be aware of the potential ocular side effects of drugs and supplements and take steps to prevent and manage them 2, 3, 4, 5, 6