21 Questions
What does the sagittal depth (CL-SAG) parameter define?
The height of the lens
How does the sagittal depth change as the lens diameter increases?
It increases
What method is used to determine the base curve (BOZR) in relation to perspex domes?
Templates method
Why is it recommended to make HWC lenses thicker despite having high DK?
Thicker lenses dehydrate less
Which substances can bind to the surface of hydrogel contact lenses?
Proteins
What is the purpose of using translucent tints in enhancing SCLs?
To enhance natural eye color
Why are thin HWC lenses not ideal in terms of dehydration?
They cover the area with the least tear coverage
What will happen if the lens is flatter than the dome?
A section of the lens edge will lift off the periphery of the dome.
What is a common advantage of Spherical SCLs?
Better initial comfort compared to RGPs.
What is a unique feature of High DK SiHy SCLs?
They provide more oxygen for ocular health.
What is the typical range for Base Curve (BC) in soft contact lenses?
8.0-9.20mm
How does the Center Thickness (CT) of soft contact lenses compare to rigid gas permeable lenses?
Thinner
What does a higher Water Content (WC) in soft contact lenses generally result in?
Challenging handling
What parameter is considered the most important when dealing with Soft Contact Lenses (SCLs)?
Base Curve
How does increasing the Center Thickness (CT) impact the rigidity of soft contact lenses?
Increases rigidity
What does lenticulated design in soft contact lenses aim to maintain?
Thin profile
What is the typical Center Thickness (CT) for a -3D soft contact lens?
-0.09mm
If a soft contact lens has a low Water Content (WC), what characteristic is it likely to have?
Less durability
What does a larger Overall Diameter (OAD) in soft contact lenses contribute to?
Increased tear exchange
What is the primary reason behind lenticulating soft contact lenses?
To maintain a thin profile of the lens
Which factor determines the rigidity of soft contact lenses relating to Central Thickness?
(CT)3
Learn about the sagittal depth measurement in lenses, which is influenced by factors like base curve, intermediate curves, and lens diameter. Discover how increasing the diameter affects the sagittal depth.
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