Pinhole visual acuity assessment is an important form of preoperative examination performed in cases with higher-order refractive error that helps to apprise the surgeon and the patient of the best possible vision that can be achieved after an intraocular surgery.
The pinhole helps to filter stray light from the periphery of the cornea in cases with higher-order corneal irregular astigmatism (Figure 1). The pinhole effect blocks distorted and unfocused light rays emanating from the peripheral cornea and isolates more focused central and paracentral rays through the central aperture, thereby
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