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  Evaluation of anterior-posterior length of eyeball
 A-scan and B-scan: Ultrasound techniques are used in these techniques and the ultrasound probe can be applied directly to the eye or eyelid after anesthesia drops. A-scan Part of the pre-evaluation the procedure is cataract surgery because precision eye length must be preceded before surgery to accurately determine the required intraocular lens strength. B-scan also accurately identifies the anatomy and internal shape of the eye, so accurate information can be obtained when there is a barrier to retinal evaluation, such as when there is severe cataracts or vitreous hemorrhage. It can also be used to examine internal eye tumors.
Equipment such as Vumax is used to perform the above operations.IOL Master is one of the advanced devices that can measure anterior-posterior eye length and curvature of the eye in one minute without contact with the eye. . Therefore, it does not have the dangers of contact with eye devices and does not require anesthesia to use it.