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Tetracaine Versus Lidocaine Gel for Anesthetic Effect and Comfort in Patients Undergoing LASIK

This study has been terminated.
(eyes that received gel had slightly thinner than intended flaps)
Information provided by (Responsible Party):
Sonia Yoo, University of Miami Identifier:
First received: June 13, 2011
Last updated: March 16, 2015
Last verified: March 2015

In this study the investigators will be comparing two different types of anesthetic, a numbing eye drop and a numbing gel, to test if they are equally effective or if one has a better outcome in terms of the level of comfort you experience one hour and one day after your surgery. The two medications are commonly used and appear to be equally effective for other types of eye surgery, such as cataract surgery. This study will show if one type of anesthesia is preferred over another by patients getting LASIK. Before your LASIK procedure, you will be given a short questionnaire to determine the baseline comfort of your eyes. In the operating room, one type of anesthetic will be put in one eye, and the other medication will be put in the other eye. Which anesthetic you get in each eye will be chosen in a random way (similar to flipping a coin). After your LASIK surgery, the investigators will ask you if you felt more comfort in your right eye, your left eye, or if they were equal, and the investigators will ask you the same survey questions that were asked prior to your LASIK to get more details about your experience.

*Of note- the randomization being done is for which eye will be receiving the lidocaine and which eye will be receiving the tetracaine. Each patient will receive lidocaine in 1 eye and tetracaine in the other eye, the randomization is for each individual eye. This means, of 11 patients in our study, 22 eyes received treatment. 11 eyes received lidocaine and 11 eyes received tetracaine.

when we did our comparison, 11 values were used for lidocaine and 11 eyes were used for tetracaine, giving a total of 22 eyes. This is important to note since the randomization refers to EYE for each individual patient, and not for the patient (ie: participant means 1 eye, not 1 person in the descriptions below).

Condition Intervention Phase
Drug: Tetracaine drop
Drug: Lidocaine gel
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: Double Blind (Investigator, Outcomes Assessor)
Primary Purpose: Supportive Care
Official Title: Comparison of 0.5% Tetracaine Drops Versus 2% Lidocaine Gel for Anesthetic Efficacy and Comfort in Patients Undergoing LASIK

Resource links provided by NLM:

Further study details as provided by Sonia Yoo, University of Miami:

Primary Outcome Measures:
  • Participants Score on Pain Scale [ Time Frame: 1 hour (60minutes) post LASIK operation ]
    Do you have sharp pain in your eye? Pain will be assessed by units on a scale of 1-5: 1 means no symptoms, 2 means slight discomfort, 3 means mild discomfort, 4 means moderate discomfort, and 5 means severe discomfort

Enrollment: 11
Study Start Date: June 2011
Study Completion Date: October 2011
Primary Completion Date: October 2011 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Tetracaine R/Lidocaine L
Participant's Right or Left eye will receive 0.5% Tetracaine drop, at 10 minutes and 5 minutes, prior to LASIK.
Drug: Tetracaine drop
0.5% Tetracaine Right eye / 2% Lidocaine Left eye
Other Name: TetraVisc, Altacaine, AK-T-Caine and Pontocaine Ophthalmic
Drug: Lidocaine gel
0.5% Tetracaine Left eye / 2% Lidocaine Right eye
Other Name: Akten
Active Comparator: Tetracaine L/Lidocaine R
Participant's Right or Left eye will receive 2% lidocaine gel, at 10 minutes and 5 minutes, prior to LASIK.
Drug: Tetracaine drop
0.5% Tetracaine Right eye / 2% Lidocaine Left eye
Other Name: TetraVisc, Altacaine, AK-T-Caine and Pontocaine Ophthalmic
Drug: Lidocaine gel
0.5% Tetracaine Left eye / 2% Lidocaine Right eye
Other Name: Akten

Detailed Description:
Outcome measures involve comparing the right eye and left eye for severity of 12 different symptoms, that are recorded in severity on a 1-5 scale. A score of 1 means no symptoms and 5 means severe. The 12 measurements include sharp pain, dull ache, pain during movement, stinging sensation, itching, light sensitivity, watery eyes, dry eyes, sandy sensation, pressure sensation, decreased vision, and blurry vision.

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • healthy volunteers of age 18 years or greater

Exclusion Criteria:

  • Previous reaction/allergy to the same drug class
  • prior ocular surgery
  • active facial injuries
  • any active current ophthalmological disease
  • history of diabetes
  • any current non- Over The Counter pain medication
  • inability to complete the questionnaire.
  • Economically or educationally disadvantaged persons, Prisoners, or Children
  • Patients with fluctuating or impaired decision-making capacity
  • Any other condition that the investigator believes would pose a significant hazard to the subject if the investigational therapy were initiated
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01383200

United States, Florida
Bascom Palmer Eye Institute
Miami, Florida, United States, 33136
Sponsors and Collaborators
University of Miami
Principal Investigator: SONIA YOO, MD University of Miami
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Sonia Yoo, PROFESSOR, University of Miami Identifier: NCT01383200     History of Changes
Other Study ID Numbers: 20101016
Study First Received: June 13, 2011
Results First Received: January 14, 2013
Last Updated: March 16, 2015

Keywords provided by Sonia Yoo, University of Miami:

Additional relevant MeSH terms:
Central Nervous System Depressants
Physiological Effects of Drugs
Anesthetics, Local
Sensory System Agents
Peripheral Nervous System Agents
Anti-Arrhythmia Agents
Voltage-Gated Sodium Channel Blockers
Sodium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action processed this record on May 25, 2017