Corrected vision, as opposed to uncorrected vision, primarily addresses refractive errors. Uncorrected vision represents your natural visual acuity, while corrected vision is the visual sharpness achieved through corrective lenses. In other words, corrected vision is the visual acuity obtained when wearing glasses.Currently, three primary methods are used to correct refractive errors: wearing eyeglasses, using orthokeratology (OK) lenses, and undergoing laser surgery. Eyeglasses remain the most commonly used option. While they can affect appearance, continuous technological advancements have made frames increasingly lightweight and transitioned lenses from glass to the now widely used plastic (resin) lenses. Wearing eyeglasses is still the safest method for correcting vision.Orthokeratology (OK Lenses) Originating in the United States, orthokeratology has evolved over 50 years and is now used in 34 countries worldwide. Orthokeratology lenses feature a specially designed reverse geometry, with their inner surface composed of multiple curved segments.The uneven distribution of the lens over the tear film creates a hydrodynamic effect that reshapes the cornea. Worn over the cornea during sleep, it gradually flattens the corneal curvature and shortens the eye's axial length, effectively halting myopia progression. This technology is hailed as "a method to control and correct myopia while you sleep."
Corrected vision, as opposed to uncorrected vision, primarily addresses refractive errors. Uncorrected vision represents your actual visual acuity, while corrected vision is the visual acuity achieved after refractive errors are corrected with eyeglasses. In other words, corrected vision is the visual acuity obtained while wearing glasses.
Fitting Process
A standardized fitting protocol is essential for ensuring the effectiveness and safety of orthokeratology lenses during wear. Following clinical guidelines, the entire process can be divided into the following stages: 1) Selection of suitable wearers; 2) Eye health examination and documentation; 3) Standardized refraction; 4) Evaluation and adjustment of orthokeratology lenses; 5) Lens ordering and distribution;6) Follow-up and issue management;
Advantages
1. Rapid improvement in visual acuity.
2. Effective reduction in myopic refractive error, potentially eliminating the need for glasses or contact lenses.
3. Simple operation and convenient use.
4. No risks; other ocular functions remain unaffected.
5. Inhibits the progression of myopia in adolescents.6. Meets distant vision requirements for certain professions (athletes, divers, pilots, actors, students, military personnel, etc.).
Early prevention, effective correction, and management of myopia in adolescents have become critical topics in optometry. Some practitioners suggest adolescents need not concern themselves with myopia severity, advising they wait until age 18 for refractive surgery—a passive approach.
The period before age 18 represents the fastest progression of myopia and coincides with the heaviest academic workload. Without corrective control measures, myopia progression is highly likely, especially in children with a family history of high myopia, where annual increases of 1.00D to 2.00D are common. Furthermore, refractive surgery is not an absolutely effective or safe cure for myopia.
Numerous non-surgical methods for controlling myopia progression exist today. However, clinical trials by experts worldwide have consistently validated orthokeratology (OK) lenses as the most reliable approach.