Age and Sex Variation in the Duration of Action and Corneal Touch Threshold (CTT) following Instillation of 0.5% Topical Ophthalmic Proparacaine and Tetracaine Hydrochlorides

Table 2

Minimum CTT values and total duration of effect with respect to sex.

Anesthetic	Sex	Minimum CTT (cm)	Total duration (min)
Proparacaine HCL	Female	0.13 ± 0.60	20
	Male	0.12 ± 0.52	25
Tetracaine HCL	Female	0.26 ± 0.93	20
	Male	0.33 ± 0.96	25