Anxiety-related Fixation Instability During LASIK

Refractive Errors Clinical Trial

Official title:

Anxiety-related Fixation Instability During Laser in Situ Keratomileusis (LASIK)

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT06148428
• Other study ID #: ARFILASIK
• Status: Completed
• Start date: August 15, 2018
• Est. completion date: July 15, 2023

Study information

• Verified date: November 2023
• Source: Assiut University
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Anxiety is common among patients undergoing eye surgery, which is typically performed under topical anesthesia while the patient is awake. This can be an unsettling experience for patients, who may worry about being able to keep their eyes still during surgery, cooperate with the surgical team, and remain immobile in an unfamiliar environment. Patients may also experience anxiety due to concerns about surgical pain, possible complications, and the uncertainty of the outcome of the surgery.

In this study, the investigators aimed to investigate the correlation between the severity of anxiety symptoms during LASIK, and fixation instability during photo-ablation as plotted by the eye tracker.

Description:

Patient cooperation during LASIK is essential for the surgeon's comfort and predictable results. Fixation instability, which is the inability of the patient to keep their eye still during surgery, is a common problem during LASIK surgery and may lead to unexpected outcomes.

Eye movements occur continually during the excimer ablation. These eye movements can have a large amplitude, a frequency of over 100 Hz, and a corneal speed of around 150 mm/s. With the advancement of scanning-spot excimer lasers, much work has focused on increasing the efficacy of the photo-ablation and smoothness of the ablated surface, especially with respect to the position of the patient's eye by developing state-of-the-art eye trackers to help maintain alignment during photoablation, which can improve refractive outcome.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 2435
• Est. completion date: July 15, 2023
• Est. primary completion date: July 15, 2023
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Candidates undergoing LASIK with

1. Myopia up to 12 diopters

2. Hyperopia up to 6 diopters

3. Astigmatism up to 6 diopters

Exclusion Criteria:

1. Previous corneal surgery,

2. Pregnant or lactating females,

3. Concomitant ocular or systemic disease that contraindicated LASIK,

4. Patients with communication barriers, hypochondria, previous stressful surgical experiences, taking psychotropic drugs, or having a history of any clinically relevant psychiatric or cardiovascular disease.

Related Conditions & MeSH terms

• Refractive Errors

Intervention

Procedure:
• Laser in situ keratomileusis (LASIK)
Patients were planned to undergo laser in situ keratomileusis. Local anesthesia was achieved by preservative-free oxybuprocaine hydrochloride 0.4% drops (a commonly used topical anesthetic due to its effectiveness in alleviating pain and ocular surface discomfort during the procedure). During surgery, the lights of the operating room were dimmed as much as possible and the surgeons spoke to the patients in a calm voice and explained what was happening. They also reassured the patients that the surgery was going as planned and would be over soon. For patients undergoing (Microkeratome) MK-LASIK, a Moria 2 Microkeratome (Moria SA, Antony, France) was used to create the flap. For patients undergoing Femtosecond LASIK (FS-LASIK), the Allegretto Wave Light FS-200 femtosecond Laser (Alcon labs, Fort Worth, TX, USA) was used for flap creation. Laser ablation was performed using WaveLight EX500 Excimer Laser (Alcon labs, Fort Worth, TX, USA) with a planned post-operative emmetropia.

Locations

Country	Name	City	State
Egypt	Tiba Eye Center	Assiut

Sponsors (1)

Lead Sponsor	Collaborator
Assiut University

Country where clinical trial is conducted

Egypt, 

References & Publications (1)

Ramirez DA, Brodie FL, Rose-Nussbaumer J, Ramanathan S. Anxiety in patients undergoing cataract surgery: a pre- and postoperative comparison. Clin Ophthalmol. 2017 Nov 10;11:1979-1986. doi: 10.2147/OPTH.S146135. eCollection 2017. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	The eye-tracking pupil position plot	This is a scheme that allows the system to capture the image, process it, and then verify eye position with the next image before releasing the pulse. After treatment, the system releases a summarized treatment report including a plot that depicts various pupil center positions within 3.0 mm off-center (on x and y axes) relative to the eye tracking cameras during ablation.	Immediately following surgery
Secondary	Heart rate	Upon entering the operating room, patients were attached to a pulse oximeter, and an operating room nurse recorded the heart rate (HR) at the start of the operation, during flap creation, during ablation, and at the end of surgery.	During and at the end of surgery.
Secondary	Subjective evaluation of patient's cooperation by surgeon:	The patient's cooperation during the surgery period was graded by the surgeon choosing a number on a scale from one to ten considering 1 as totally cooperative (calm and steady fixing) and 10 as totally uncooperative (marked eye and head movement and/or lid squeezing).	Immediately following surgery.