In refractive cataract surgery, accurate intraocular lens (IOL) power calculation is crucial for achieving desired refractive outcomes.
Factors such as measurement errors of axial length (AL), corneal power, and pseudophakic anterior chamber depth (ACD) affect refractive status. Optical biometry has gained popularity due to its non-invasiveness and inter-operator reproducibility.
Devices like IOLMaster 700, Argos, and OA-2000 use swept-source optical coherence tomography (SS-OCT) for accurate measurements.
Total corneal astigmatism is a critical element in correcting astigmatism during cataract surgery. Newer technologies like slit-scanning technology, Scheimpflug devices, and optical coherence tomography are used for measuring the posterior corneal surface.
The IOLMaster 700 is the first swept-source OCT biometry device, enabling high-speed and high-resolution imaging of the cornea and better corneal thickness measurement than scanning-slit topography. It combines unique telecentric keratometry measurement of the anterior corneal surface with measurement of the posterior corneal surface in order to calculate Total Keratometry (TK).

AIM OF THE WORK:
To describe and analyze the total, anterior and posterior corneal astigmatism measurements obtained from the IOLMaster 700 and assess how they compare to measurements by other devices.