Visual acuity suppression
Visual acuity suppression is the degradation of the sharpness and clarity of one's vision, resulting in vision becoming partially to completely blurred and indistinct.   This may affect either the entirety of the person's vision or specific sections of it. The experience of acuity suppression is comparable to looking through an out of focus lens that degrades the detail one can see in the external environment. Depending on its intensity, this can often result in a reduced ability to function and perform basic tasks that necessitate the use of sight. Visual acuity suppression is often accompanied by other coinciding effects, such as double vision and visual agnosia. This effect is most commonly induced under the influence of moderate dosages of depressant and dissociative compounds, such as alcohol  , quetiapine  , ketamine  , and DXM  .
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- Dextromethorphan (Oral Route) | https://www.mayoclinic.org/drugs-supplements/dextromethorphan-oral-route/side-effects/drg-20068661