What is the difference between lathe-cut and cast-moulded GP lenses?

What is the difference between lathe-cut and cast-moulded GP lenses?

• A. Lathe-cut lenses are machined from a solid blank; cast-moulded lenses are produced by casting; both are GP but have different manufacturing processes.
• B. Cast-moulded lenses are not gas-permeable.
• C. Lathe-cut lenses are disposable; cast-moulded are reusable.
• D. Lathe-cut lenses are softer than cast-moulded lenses in all cases.

Answer: (D)