Final answer:
Ortho-K can be used to correct high myopia (-6.00 to -9.00D), but its effectiveness may vary significantly, therefore it is deemed partially effective. Results depend on various factors beyond corneal curvature, including corneal thickness.
Step-by-step explanation:
Ortho-K, short for Orthokeratology, is a method used to correct myopia by reshaping the cornea using specially designed contact lenses. The lenses are worn overnight to flatten the cornea, which can temporarily correct nearsightedness. For high myopia in the range of -6.00 to -9.00 diopters (D), Ortho-K can be challenging due to the significant amount of correction required.
Options A and C are both partially correct. Ortho-K does have the ability to precisely reshape the cornea, which can make it effective for high myopia. However, the degree of effectiveness can vary from person to person. Therefore, while Ortho-K lenses can be designed to target higher levels of myopia, the outcome can be partial correction depending on factors such as corneal thickness and rigidity. Given this information, the effectiveness of Ortho-K for high myopia is better described as partially effective, with the understanding that results might not be as consistent as they are for lower levels of myopia.