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  • Title: Corneal sensation after topical anesthesia.
    Author: Nomura K, Singer DE, Aquavella JV.
    Journal: Cornea; 2001 Mar; 20(2):191-3. PubMed ID: 11248828.
    Abstract:
    PURPOSE: To compare the topical effects of tetracaine, lidocaine, and bupivacaine on corneal sensitivity in normal eyes. METHODS: Corneal touch sensitivity was measured with a Cochet-Bonnet anesthesiometer before and at 2.5-minute intervals after instillation of the anesthetic agent, until baseline levels had been reestablished. Seventeen healthy volunteers were randomized into five groups. Group 1 included 0.5% tetracaine (n = 6); group 2, 4% lidocaine (n = 8); group 3, 0.75% bupivacaine (n = 8); group 4, 0.5% tetracaine + 4% lidocaine (n = 5); and group 5, 0.5% tetracaine + 0.75% bupivacaine (n = 7). RESULTS: The duration of anesthesia showed no differences between groups 1, 3, and 5. Although there was no difference between groups 2 and 4, both groups demonstrated significantly longer effects than groups 1, 3, and 5 (p < 0.005). CONCLUSION: The application of 4% lidocaine results in a significantly prolonged topical anesthetic effect when compared with tetracaine and bupivacaine.
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