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The main purpose of corneal refractive surgery is not only to improve vision, but also to improve visual quality, which is a higher level of visual ability except vision.At present, most corneal refractive surgeries take the pupil center as the center of examination and treatment, since changes in body position may result in pupil centroid shifts and eye cyclotorsion and postoperative visual quality can be affected by undercorrected astigmatism, induced astigmatism and increased high order aberration that results from eccentric cutting occurring during corneal refractive surgery.The measurement of centroid shifts and eyeball rotation that can be attributed to the change of body position guiding the design of surgery is of great significance to enhance the accuracy of pupil center positioning, improve the safety of surgery and promote the postoperative visual quality.In this article, the relevant literature on the measurement methods of the pupil centroid shifts and ocular cyclotorsion, pupil centroid shifts and ocular cyclotorsion measured by iris recognition technology in response to changes in body position, and the effects of posture-related pupil centroid shifts and ocular cyclotorsion during refractive surgery on postoperative visual quality (postoperative astigmatism, aberration, and modulation transfer function) were reviewed.
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Clinical College of Ophthalmology, Tianjin Medical University, Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Visual Science, Tianjin 300020, China
Clinical College of Ophthalmology, Tianjin Medical University, Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Visual Science, Tianjin 300020, China