A recent study conducted by Moroccan and international researchers examined the impact of cannabis use on visual parameters among users in Morocco.
The research, titled “Effects of Cannabis on Multiple Visual Parameters and Self-Perceived Eyesight: A Cross-Sectional Study in Cannabis Users in Morocco,” included 95 participants, predominantly single men (87.4%) with a mean age of 33.6 years. Most participants (83.4%) reported pre-existing vision conditions such as myopia or astigmatism.
The study, carried out in the Marrakech-Safi region, found that while blurred near or far vision was uncommon, 66.3% of users experienced heightened sensitivity to daylight, indicating some visual discomfort linked to cannabis consumption.
Conversely, 33.7% reported improved night vision, particularly among those using hashish or a combination of kif and hashish.
Common eye-related symptoms among participants included red eyes (75.8%), ptosis (67.4%), watery eyes (30.5%), and swollen eyelids (27.4%), whereas dry eye (5.3%) and nystagmus (4.2%) were rare.
The majority of participants had no diagnosed eye disease (97.9%), and over half (50.5%) had never undergone an eye examination. Hyperopia combined with astigmatism (31.6%) and astigmatism alone (13.7%) were the most prevalent refractive errors.
Hashish emerged as the most frequently used form of cannabis (57.9%), primarily smoked. Additionally, 58.9% of participants reported a family history of cannabis use, particularly among first-degree relatives, with brothers (22.1%) and fathers (15.8%) most commonly involved.
The research also concluded that cannabis consumption, whether hashish, kif, or both, was not associated with changes in eye alignment at near or far distances, suggesting that while certain visual symptoms may arise, basic ocular coordination remains unaffected.
The findings highlight the nuanced effects of cannabis on vision and underscore the importance of eye health monitoring for users.
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