This book integrates the conceptual background, step-by-step surgical methodology, and accumulated clinical evidence for the Eight-chop technique, an original nuclear fragmentation strategy designed to complete cataract nucleus division entirely within the capsular bag. Drawing from previously published studies and original analyses, it provides a comprehensive framework linking surgical mechanics, fluidics, and clinical outcomes. By minimizing ultrasound energy, irrigation volume, and instrument interference, the technique aims to maximize surgical efficiency while reducing intraoperative stress on the corneal endothelium and anterior chamber structures.

Unlike conventional chop techniques, Eight-chop emphasizes reproducible intracapsular segmentation under stable anterior chamber conditions, including Active Fluidics Systems (AFS). Since its introduction, the technique has been applied to a wide spectrum of cataract types, including hard nuclei, white cataracts, shallow anterior chambers, and microcornea. 

Ideal for cataract surgeons from early-career to experienced practitioners, ophthalmology residents, and researchers in surgical fluidics, this book offers a comprehensive framework linking surgical mechanics, fluidics, and clinical outcomes. Dr. Tsuyoshi Sato, the originator of the Eight-chop technique, presents an evidence-based approach that emphasizes reproducibility, efficiency, and safety in modern phacoemulsification.

Tsuyoshi Sato, MD, PhD
Ophthalmologist, Cataract Surgeon
Developer of the Eight-chop technique

Dr. Sato is the originator of the Eight-chop nuclear fragmentation technique, a complete intracapsular segmentation strategy designed to enhance surgical efficiency and minimize invasiveness in modern phacoemulsification. He has authored multiple peer-reviewed original articles and reviews in international ophthalmology journals, addressing surgical outcomes related to nuclear hardness, corneal endothelial safety, anterior chamber stability, white cataract, microcornea, and low intraocular pressure conditions.

His work consistently focuses on technique-driven optimization of cataract surgery supported by quantitative clinical evidence. The Eight-chop technique has been developed, refined, and validated through a series of clinical studies, forming the scientific foundation of this proposed monograph.