Question

For myopia control, Ortho-K and soft MF are two options that can be utilized.

Compare these methods of corrections for the following parameters:
1) sphere
2) cyl
3) WTR/ATR
4) age
5) hobbies
6) pupil size

Answer 1

Ortho-K and soft MF contact lenses are both used for myopia control, with Ortho-K commonly used for low to moderate myopia and capable of correcting astigmatism and providing myopia progression control, especially for children. Soft MF lenses are worn during the day and can depend on pupil size for effectiveness. Neither require surgery, offering an alternative to Lasik which permanently reshapes the cornea.

Step-by-step explanation:

When comparing Ortho-K (orthokeratology) and soft multifocal (MF) contact lenses for myopia control, we can analyze these options based on several parameters:

• Sphere: Both Ortho-K and soft MF contact lenses can be prescribed to correct myopia with varying degrees of negative spherical power. However, Ortho-K is often used for low to moderate myopia.
• Cyl (cylinder): Ortho-K can correct certain levels of astigmatism (cylindrical errors), whereas soft MF lenses might have limitations for higher degrees of cylinder correction.
• WTR/ATR (With-The-Rule/Against-The-Rule astigmatism): Ortho-K lenses can be designed to correct for WTR or ATR astigmatism, but soft MF lenses may not be as effective in ATR astigmatism correction.
• Age: Both types of contact lenses can be used in children and adults, but Ortho-K is often recommended for children since it can provide the additional benefit of myopia progression control.
• Hobbies: Ortho-K lenses are worn overnight and removed during the day, making them suitable for activities where contacts may interfere (e.g., swimming). Soft MF lenses are worn during the day and may thus require special care during water activities.
• Pupil size: The effectiveness of soft MF lenses can depend on pupil size, because the design incorporates different zones for near and distant vision, whereas Ortho-K reshapes the cornea, making pupil size less of an issue.

It is also noteworthy that both Ortho-K and soft MF lenses are non-surgical alternatives to procedures such as Lasik surgery, which permanently changes the shape of the cornea using laser technology to correct vision problems like myopia.