Disclaimer
Last updated: May 31, 2026
The information and tools provided on VertexLensCalc (vertexlenscalc.com) are intended for general informational and educational purposes only. Please read this Disclaimer carefully before using any content or tools on this Website.
1. Not a Medical or Professional Service
VertexLensCalc is an independent digital tool website. It is not a medical practice, a licensed optical provider, or a healthcare organization. The operators of this Website are not optometrists, ophthalmologists, physicians, or any other licensed health care professionals.
Nothing on this Website should be interpreted as medical advice, a clinical diagnosis, or a professional prescription. The calculator results, articles, and any other content published on this Website do not replace the advice, judgment, or recommendation of a qualified and licensed eye care professional.
2. Calculator Results Are Estimates Only
The vertex distance calculator applies the standard clinical formula (Fc = Fs ÷ (1 − d × Fs)) used in optometric practice, following ISO 8980-1 and ANSI Z80.1 rounding conventions. However:
- Calculator results are mathematical estimates, not prescriptions.
- Contact lens prescriptions require additional fitting parameters — including base curve, diameter, lens material, and brand-specific power availability — which cannot be determined by a calculator and require an in-person fitting examination.
- Individual anatomical differences, corneal shape, tear film characteristics, and other clinical factors may affect the appropriateness of any calculated value for a specific individual.
- Results should always be verified by a licensed eye care professional before ordering or wearing contact lenses.
3. No Doctor-Patient Relationship
Use of this Website does not create a doctor-patient relationship, a client relationship, or any other professional relationship between you and VertexLensCalc or its operators. The content of this Website is not a substitute for professional medical advice and should not be treated as such.
4. Always Consult a Professional
If you have concerns about your vision, eye health, or the suitability of any contact lens prescription, we strongly encourage you to:
- Schedule an eye examination with a licensed optometrist or ophthalmologist
- Obtain a current, valid contact lens prescription from a qualified professional
- Follow the guidance of your eye care provider regarding lens type, replacement schedule, and care instructions
Wearing incorrectly prescribed contact lenses may cause discomfort, vision impairment, or serious eye injury.
5. Accuracy of Information
We make reasonable efforts to ensure the accuracy of the information and calculations provided on this Website. However, we make no warranties or representations — express or implied — as to the completeness, accuracy, reliability, suitability, or availability of any information or tool on the Website. Any reliance you place on such information is strictly at your own risk.
6. External Links
This Website may contain links to external websites, including sources such as the American Academy of Ophthalmology, ISO standards bodies, or scientific publications. These links are provided for informational convenience only. VertexLensCalc does not endorse, control, or take responsibility for the content of any external site linked from this Website.
7. Limitation of Liability
VertexLensCalc and its operators shall not be held liable for any loss, injury, or damage — including without limitation indirect, consequential, or punitive damages — arising from:
- Reliance on any information or calculator result provided on this Website
- Use of contact lenses based on results from this Website without professional verification
- Any errors, omissions, or inaccuracies in the content of this Website
8. Informational Purpose Only
This Website exists to make the vertex distance conversion formula accessible to curious individuals, students of optometry, and eyeglass/contact lens wearers who want to understand how prescription conversion works. It is a free, independent, non-commercial educational resource — not a substitute for professional optical care.
Contact
If you have questions about this Disclaimer, please reach out to us at contact@vertexlenscalc.com.