Free LASIK Preoperative Assessment Questions and Answers — Questions and Answers

Question 1: Which diagnostic tool is essential for assessing corneal thickness before LASIK surgery?

Autorefractor
Topographer
Pachymeter (Correct answer)
Retinoscope

Correct answer: Pachymeter

A pachymeter is a specialized diagnostic tool used to measure the thickness of the cornea. This measurement, known as pachymetry, is crucial before LASIK surgery because the procedure involves removing a small amount of corneal tissue to reshape the eye. Sufficient corneal thickness is necessary to ensure the eye remains stable and healthy after the surgery.

Question 2: Why is pupil size evaluated during a LASIK preoperative exam?

To detect dry eye syndrome
To predict intraocular pressure
To prevent infection
To assess risk of night vision problems (Correct answer)

Correct answer: To assess risk of night vision problems

Pupil size is evaluated during a LASIK preoperative exam to assess the risk of potential night vision problems post-surgery, such as glare, halos, or starbursts. If a patient's pupils dilate significantly in low light, and the laser treatment zone is smaller than the dilated pupil, light entering the eye through the untreated peripheral cornea can cause these visual disturbances. This assessment helps surgeons determine candidacy and tailor treatment plans.

Question 3: What refractive error range is typically considered suitable for LASIK?

+10.00 to +20.00 D
-15.00 to -25.00 D
-1.00 to -12.00 D (Correct answer)
Any level of hyperopia

Correct answer: -1.00 to -12.00 D

LASIK surgery is most effective and safest within a specific range of refractive errors. While the exact range can vary slightly based on individual factors and surgeon discretion, a common suitable range for myopia (nearsightedness) is approximately -1.00 to -12.00 diopters (D). Treating outside this range may lead to less predictable outcomes or compromise corneal integrity.

Question 4: Which condition is a contraindication for LASIK surgery?

Mild myopia
Presbyopia
Keratoconus (Correct answer)
Astigmatism under 2.00 D

Correct answer: Keratoconus

Keratoconus is a progressive eye disease where the cornea thins and bulges into a cone-like shape, leading to distorted vision. It is an absolute contraindication for LASIK surgery because removing additional corneal tissue would further weaken the already compromised cornea, potentially worsening the condition and leading to severe vision loss. LASIK relies on a healthy, stable cornea.

Question 5: What is the purpose of corneal topography in a LASIK evaluation?

To examine retinal health
To check for glaucoma
To map corneal curvature (Correct answer)
To determine tear film quantity

Correct answer: To map corneal curvature

Corneal topography is a vital diagnostic tool that creates a detailed, three-dimensional map of the corneal surface's curvature and elevation. This map helps identify irregularities, astigmatism, and conditions like keratoconus, which are critical for determining LASIK candidacy and planning the precise laser ablation pattern. Accurate corneal mapping ensures the laser reshapes the cornea correctly for optimal vision correction.

Question 6: Which systemic condition should be disclosed during a LASIK pre-op assessment?

Migraines
Diabetes
Lupus (Correct answer)
Sinus infection

Correct answer: Lupus

Systemic autoimmune diseases like Lupus are important contraindications for LASIK surgery. These conditions can impair the body's healing process, increase the risk of complications, and affect the stability of the cornea post-surgery. Patients with active autoimmune diseases are generally not considered good candidates for elective procedures like LASIK due to these potential risks.

Question 7: What role does tear film evaluation play in LASIK candidacy?

To detect cataracts
To evaluate color vision
To assess dry eye risk (Correct answer)
To measure lens thickness

Correct answer: To assess dry eye risk

Tear film evaluation is crucial in LASIK candidacy because the surgery can temporarily exacerbate or induce dry eye syndrome. A healthy tear film is essential for corneal healing and maintaining clear vision post-operatively. Assessing the quantity and quality of tears helps identify patients at higher risk for significant dry eye symptoms and allows for appropriate pre-operative management or alternative treatment recommendations.

Question 8: What is the significance of checking for corneal scars during pre-op exams?

Scars enhance healing
They indicate dry eyes
They improve laser tracking
They may distort results (Correct answer)

Correct answer: They may distort results

Corneal scars, even minor ones, can significantly impact the outcome of LASIK surgery. Scars alter the normal curvature and transparency of the cornea, potentially leading to inaccurate measurements during the pre-operative assessment and unpredictable or suboptimal vision correction after the laser treatment. They can also interfere with proper healing and increase the risk of complications.

Question 9: How does age factor into LASIK eligibility?

Only for people over 50
No age limit applies
Minimum 18 years with stable vision (Correct answer)
Only under 40 are eligible

Correct answer: Minimum 18 years with stable vision

Age is a significant factor in LASIK eligibility. Patients must be at least 18 years old to ensure their eyes have fully developed and their refractive error has stabilized. Performing LASIK on younger individuals whose vision is still changing could lead to regression of the correction, requiring further treatment. Stable vision for at least one year is generally required.

Free LASIK Preoperative Assessment Questions and Answers

Which diagnostic tool is essential for assessing corneal thickness before LASIK surgery?