Free LASIK Intraoperative Procedures Questions and Answers — Questions and Answers
Question 1: What is the first critical step after positioning the patient for LASIK surgery?
- Apply anesthetic drops
- Align the patient’s eye with the laser (Correct answer)
- Place sterile drapes
- Activate the femtosecond laser
Correct answer: Align the patient’s eye with the laser
Proper alignment of the patient's eye with the laser system is paramount for accurate treatment delivery. This initial step ensures that the laser beam is centered correctly on the cornea, allowing for precise ablation according to the planned treatment parameters. Misalignment can lead to decentered ablation and suboptimal visual results.
Question 2: Which of the following ensures patient comfort and prevents blinking during LASIK?
- Topical steroids
- Eyelid speculum (Correct answer)
- Corneal shield
- Irrigation solution
Correct answer: Eyelid speculum
An eyelid speculum is a sterile device placed between the eyelids to hold them open throughout the LASIK procedure. This prevents involuntary blinking and ensures a clear, unobstructed surgical field for the surgeon and the laser. It also enhances patient comfort by eliminating the need for the patient to actively keep their eyes open.
Question 3: What happens immediately after creating the corneal flap?
- Flap is sutured back
- Patient is instructed to blink
- Excimer laser reshapes the cornea (Correct answer)
- Eye is irrigated with antibiotics
Correct answer: Excimer laser reshapes the cornea
After the corneal flap is created and gently lifted, the underlying stromal tissue is exposed. The excimer laser then precisely ablates (removes) microscopic amounts of this tissue to reshape the cornea according to the patient's specific refractive error. This is the core therapeutic step that corrects vision in LASIK.
Question 4: What is the purpose of eye tracking during laser ablation?
- Adjusts flap thickness
- Keeps patient alert
- Aligns corneal hydration
- Maintains precision of laser treatment (Correct answer)
Correct answer: Maintains precision of laser treatment
Eye tracking during laser ablation is essential to compensate for any small, involuntary eye movements the patient might make. The eye tracker continuously monitors the eye's position and directs the laser beam to ensure it always targets the correct area of the cornea. This real-time adjustment maintains the precision of the laser treatment, preventing decentered or irregular ablations.
Question 5: Which fluid is used to irrigate the eye during intraoperative steps?
- Normal saline
- Balanced Salt Solution (BSS) (Correct answer)
- Sterile water
- Artificial tears
Correct answer: Balanced Salt Solution (BSS)
Balanced Salt Solution (BSS) is a sterile, isotonic solution specifically formulated to mimic the natural fluid environment of the eye. It is commonly used for irrigation during ophthalmic surgeries like LASIK to keep the corneal surface moist, remove debris, and maintain a clear surgical field. BSS is gentle on ocular tissues, preventing cellular damage.
Question 6: What step is taken after laser ablation but before repositioning the flap?
- Patient is instructed to blink
- Suction is reapplied
- Irrigation of stromal bed (Correct answer)
- Flap is dried with gauze
Correct answer: Irrigation of stromal bed
After the excimer laser has reshaped the stromal bed, it is crucial to irrigate the area before repositioning the flap. This step washes away any loose tissue debris, microscopic particles, or gas bubbles generated during the laser ablation. A clean stromal bed promotes proper flap adhesion and reduces the risk of complications like epithelial ingrowth or diffuse lamellar keratitis.
Question 7: Why is the flap carefully repositioned after ablation?
- To test flap adhesion
- To maintain intraocular pressure
- To prevent dry eye
- To restore the corneal surface (Correct answer)
Correct answer: To restore the corneal surface
The corneal flap, once created, acts as a natural protective layer for the ablated stromal bed. Carefully repositioning it restores the smooth, protective outer surface of the cornea, which is vital for rapid healing and maintaining the structural integrity of the eye. This contributes significantly to quick visual recovery and reduces discomfort.
Question 8: What is used to verify flap alignment immediately after repositioning?
- OCT scan
- Tear test
- Visual inspection under microscope (Correct answer)
- Ultrasound probe
Correct answer: Visual inspection under microscope
Immediately after repositioning the corneal flap, the surgeon performs a meticulous visual inspection using a high-magnification surgical microscope. This allows for detailed assessment of the flap's alignment, ensuring it is perfectly centered and free of wrinkles (striae) or trapped debris. Proper alignment is critical for optimal visual outcomes and to prevent complications.
Question 9: What is the last step in the intraoperative LASIK procedure?
- Re-checking eye alignment
- Reapplying suction ring
- Applying antibiotic eye drops (Correct answer)
- Instructing patient to open both eyes
Correct answer: Applying antibiotic eye drops
The final intraoperative step in LASIK is typically the application of antibiotic eye drops. These drops help to prevent postoperative infection, which, although rare, is a serious complication. They provide a protective measure as the eye begins its healing process, reducing the risk of microbial contamination.
Free LASIK Intraoperative Procedures Questions and Answers
What is the first critical step after positioning the patient for LASIK surgery?