Table II.
Summary of effects of abusive drugs on ocular motility and pupil
| Ocular adverse effects | Marijuana | Narcotic analgesics | Hallucinogens | CNS depressants | CNS stimulants | Phencyclidine |
|---|---|---|---|---|---|---|
| Pupils | Dilated/normal | Constricted | Dilated | Normal | Dilated | Normal |
| Pupillary reaction to light | Normal | Slow/none | Normal | Slow | Slow | Normal |
| HGN | Not present | Not present | Not present | Present | Not present | Present |
| VGN | Not present | Not present | Not present | Possibly present | Not present | Usually present |
| Lack of ocular convergence | Present | Not present | Not present | present | Not present | Present |