Related Experiment Video
Updated: Feb 1, 2026
04:27
Anterior Capsular Reconstruction with Human Dermal Allograft for Irreparable Subscapularis Tears
Published on: May 9, 2025
475
Parameters affecting anterior capsulotomy tear strength and distension
Sheraz M Daya1, Soon-Phaik Chee2, Seng-Ei Ti3
1Centre for Sight, East Grinstead, West Sussex, United Kingdom.
Journal of Cataract and Refractive Surgery
|December 5, 2018
Summary
Continuous curvilinear capsulorhexis (CCC) with larger diameters and continuous margins provides superior tear resistance. This ensures better outcomes for anterior capsulotomies during cataract surgery.
Area of Science:
- Ophthalmology
- Biomechanical Engineering
- Surgical Techniques
Background:
- Continuous curvilinear capsulorhexis (CCC) is a crucial step in cataract surgery.
- Understanding the biomechanical properties of the anterior capsule is vital for surgical success.
Purpose of the Study:
- To evaluate how anterior capsulotomy diameter and continuity affect tear resistance.
- To determine the optimal parameters for continuous curvilinear capsulorhexis (CCC) to prevent capsular tears.
Main Methods:
- Two preclinical cadaver eye studies compared continuous vs. discontinuous capsulotomies and different diameters (5.0mm vs. 5.2mm+).
- Tensile stress testing measured tear threshold load and distension.
- Statistical analysis used Wilcoxon matched-pairs signed-rank tests.
Main Results:
- Continuous capsulotomies showed significantly higher tear resistance than discontinuous ones (P < .01).
- Larger capsulotomy diameters (≥5.2mm) were more resistant to tears than smaller ones (≤5.0mm) (P < .05).
Conclusions:
- Anterior capsulotomies function as elastomeric systems under load.
- Continuous and larger diameter capsulotomies enhance resistance to anterior tears, reducing tear initiation risks.
Related Concept Videos
03:05Acid Strength and Molecular Structure
33.1K
Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
33.1K
01:20Strength of Cement
499
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
499
01:30Relation Between Tensile Strength and Compressive Strength of Concrete
685
Concrete is a fundamental building material, and understanding its strengths is crucial for construction projects. The relationship between its tensile and compressive strengths is intricate, showing that while these strengths are related, they do not increase at the same rate. Tensile strength's growth is slower and is affected by various factors such as the methods used for testing, the size and shape of the specimen, the texture of the aggregate used, and the moisture content of the...
685
02:18The Equilibrium Binding Constant and Binding Strength
15.0K
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
15.0K
01:10Wave Parameters
9.4K
The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
9.4K
01:29Strength and Heat of Hydration
691
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
691