For colleagues and clinicians
Professional Information
Professional context, evidence references and illustrative examples for corneal, specialist contact-lens and myopia-management discussions.
Evidence.
Context.
Discussion.
This information does not provide patient-specific clinical guidance. Assessment, prescribing and fitting decisions require appropriate professional evaluation.
Choose a clinical perspective
Three specialist subjects
Keratoconus & irregular cornea
Connect corneal shape, irregular optics and the role of specialist lens care.
View professional informationOrthokeratology
Follow the temporary optical effect, the lens–cornea relationship and ongoing care.
View professional informationMyopia management
Distinguish refractive focus, eye growth and monitoring within a family conversation.
View professional informationEvidence, with context
A model is a starting point
for a clinical conversation.
Read the general concepts, compare the linked visual examples and consider the information missing from a illustrative case. Sources support further reading. This information does not provide patient-specific clinical guidance.
Clinical discussion
Illustrative case example
Case A · an irregular-cornea conversation
Illustrative case example. These observations are not measured data, a diagnosis or a prediction; no patient scan or record is used.
- Example age
- 19 years
- Reason for discussion
- Illustrative referral for distorted vision
- Map description
- Illustrative asymmetry; no calibrated measurement
- Repeat visit
- Different-looking pattern; quality/context not yet established
Step 1 of 4
What does this example let us describe?
Describe an illustrative asymmetry and a visual concern. Neither the pattern nor the story establishes a diagnosis.
A discussion prompt, not a diagnosis or a single correct treatment answer.
A shared vocabulary
Clinical glossary
12 terms shown. Search stays on this page.
- Keratoconus
- A corneal condition involving thinning and changing shape that can affect optical quality.
- Corneal topography
- Mapping of corneal surface shape; reflection-based systems describe the anterior surface.
- Corneal tomography
- Imaging that can describe anterior and posterior corneal surfaces and thickness.
- RGP
- Rigid gas permeable: a contact-lens material/type used in selected optical-care approaches.
- Scleral vault
- The space created where a fitted scleral lens arches over the cornea. This glossary gives no fitting target.
- Fluid reservoir
- The fluid layer between a scleral lens and the corneal surface, shown conceptually in the viewer.
- Orthokeratology
- Specially designed rigid-lens care that produces a temporary corneal optical effect.
- Refraction
- Assessment of the eye’s optical focusing and the correction needed for clear vision.
- Axial length
- The front-to-back dimension of the eye; a measurement considered in myopia monitoring.
- Myopia progression
- Change in myopia over time, assessed clinically with measurement context rather than a single simulated image.
- Myopia management
- A continuing approach to correction, communication, monitoring and consideration of progression-slowing care.
- Cross-linking (CXL)
- A medical-care concept discussed through an ophthalmological referral/shared-care pathway here.
Read the evidenceEvidence & sources
These sources support the concepts described here.
National Eye Institute, NIH
Public explanation of corneal thinning, changing shape and vision. Page updated 6 December 2024.
Gomes et al. · Cornea
Published consensus; PubMed abstract verified. Supports the scope of assessment and optical/medical management. Detailed thresholds are not reproduced.
Duncan, Belin & Borgstrom · Eye and Vision
Research article abstract: anterior/posterior corneal shape, thickness and measurement variability. No progression cut-off is used here.
- Year not statedSpeciality contact lens (opens in a new tab)
Moorfields Eye Hospital
Hospital explanation of a smoother optical surface and the fluid layer with scleral lenses. Publication year is not stated on the verified page.
U.S. Food and Drug Administration
Temporary corneal optical effect and continued prescribed wear. U.S. information does not establish South African product approval or this practice’s services. Publication year not stated.
Centers for Disease Control and Prevention
Avoiding lens exposure to water, including showering and swimming. Updated 27 May 2025.
Centers for Disease Control and Prevention
The prescribed lens-care system, fresh solution and manufacturer instructions. Saline is not a disinfectant. Updated 27 May 2025.
Centers for Disease Control and Prevention
Warning symptoms, immediate lens removal and urgent eye-care advice. Updated 27 May 2025.
National Eye Institute, NIH
Myopic focus and the relationship between eye shape and refraction. Updated 4 September 2025.
International Myopia Institute · Gifford et al.
Clinical summary: history, examination, refraction, axial length, communication and follow-up. It is a dated guideline, read alongside later IMI publications.
International Myopia Institute · Flitcroft et al.
Distinguishes optical correction, interventions intended to slow progression, and comprehensive management; explains monitoring and regulatory context.
International Myopia Institute
Update across definitions, clinical management and other myopia research. Included as a route to newer evidence, without reproducing treatment algorithms.
Connected professional care
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Use the separate professional enquiry pathway. Case reflections and choices do not become referral information.