“…3,16,19,25,41,42,44,45,49,68,81,83,106,130,191,192 Third, street drugs are not often consumed in their pure form, as they may be diluted or cut with additional compounds, which may carry unknown biological effects which may also be confounding. 81,143 For example, heroin is sometimes known to be cut with quinine, 82 cocaine has been reported to be cut with sodium bicarbonate, sugar, local anaesthetics, amphetamines, caffeine, or heroin. 66 Fourth, many news drugs are not detected by the regular screenings, which may lead to underreporting of drug-related ocular effects.…”