1.For Educational & Professional Reference Only
The optical calculation tools provided on Asaan Optics (including the Optical Transposition Calculator, Spherical Equivalent Calculator, Vertex Distance Converter, Reading ADD Estimator, Prentice's Rule Induced Prism Calculator, Lens Thickness Calculator, and related ophthalmic calculators) are created strictly for educational reference, dispensing optician verification, and optical lab workflow support.
Nothing on this website constitutes direct ophthalmic medical diagnosis, clinical medical advice, or an alternative to a comprehensive eye examination performed by a licensed optometrist or ophthalmologist.
2.Practitioner Verification Responsibility
While all algorithms powering our tools follow established optical physics formulas (such as Prentice's rule, focal power transformations, and standard toroidal lens transposition rules), variations in lens materials, index of refraction (e.g. 1.50, 1.56, 1.61, 1.67, 1.74), base curves, frame pantoscopic tilt, and vertex distance can impact real-world visual comfort.
Qualified eye care professionals must exercise their own independent clinical judgement and verify patient prescription parameters prior to ordering lenses from optical glazing laboratories or dispensing corrective eyewear.
3.Limitation of Liability
Techwine Solutions and the developers of Asaan Optics expressly disclaim any liability for direct, indirect, incidental, or consequential damages resulting from errors, omissions, or inaccuracies in mathematical calculations generated through this website. Use of these calculators is at the user's sole risk and discretion.