Foveal pit morphology evaluation during optical biometry measurements using a full-eye-length swept-source OCT scan...

Area of Science:

• Ophthalmology
• Medical Imaging
• Biometry

Background:

• Accurate biometric measurements are crucial for intraocular lens (IOL) power calculation in cataract surgery.
• Optical coherence tomography (OCT) is a key technology for assessing retinal structures.
• Swept-source OCT (SS-OCT) offers potential advantages in penetration depth and speed over spectral-domain OCT (SD-OCT).

Purpose of the Study:

• To evaluate the scan quality of foveal pit morphology (FPM) using a novel SS-OCT biometer prototype (IOLMaster700).
• To quantify central retinal thickness (CRT) measurements obtained with the SS-OCT biometer.
• To compare FPM and CRT results with those from a standard SD-OCT device (Cirrus4000).

Main Methods:

• 1 mm central horizontal retinal B-scans were acquired using the SS-OCT biometer prototype from phakic and pseudophakic eyes.
• Foveal pit morphology was subjectively assessed and compared between SS-OCT and SD-OCT techniques.
• Repeatability and accuracy of CRT measurements from the SS-OCT device were analyzed and compared to SD-OCT.

Main Results:

• The SS-OCT biometer's 1 mm retinal B-scan resolution was lower than SD-OCT, but advanced pathologic features were visible.
• Repeatability of CRT measurements with the SS-OCT showed an overall intraclass correlation of 0.57.
• CRT measurements differed significantly between the SS-OCT and SD-OCT in phakic eyes (group I).

Conclusions:

• The SS-OCT biometer provides acceptable, though not superior, repeatability and accuracy for CRT measurements compared to SD-OCT.
• The device's ability to discern FPM and pathologic characteristics is valuable for pre-operative assessment.
• This SS-OCT scan biometry holds potential for enhancing patient examination and surgical planning in cataract procedures.