Ophthalmic Lens Geometry Simulator
An interactive simulator for exploring ophthalmic lens geometry. Visualize how lens form, surface curves, diameter, and thickness relate to the shape and construction of an ophthalmic lens.
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Showing all 13 apps
Base Curve Chart
An interactive chart for selecting the appropriate base curve for a given lens power. It helps you choose a front-surface curve that keeps the lens in its optimal “best-form” range and minimizes oblique aberrations.
Launch AppVogel’s Formula
A calculator that applies Vogel’s rule to recommend a base curve from the spherical equivalent of a prescription (about SE + 6.00 D for plus lenses, and SE÷2 + 6.00 D for minus lenses). Useful for quickly estimating a starting base curve.
Launch AppToric Transposition
A tool for converting spherocylindrical prescriptions between plus-cylinder and minus-cylinder forms and working through toric transposition to crossed-cylinder / toric surface notation. Great for drilling transposition until it becomes automatic.
Launch AppFrame Master Flash Cards
A flashcard set for learning and reviewing spectacle frame parts and terminology — bridge, rims, end pieces, temples, lugs, and more. A quick way to commit frame nomenclature to memory before lab and exams.
Launch AppBoxing System Blitz
A fast-paced drill on the boxing system of frame and lens measurement — the standard method that encloses the lens shape in a rectangle to define dimensions such as eye size (A), vertical depth (B), effective diameter (ED), and distance between lenses (DBL). Builds speed and accuracy in reading frame markings.
Launch AppLens Clock Simulation
A virtual Geneva lens measure (lens clock). You place the three pins on a lens surface and read the surface power directly from the dial, building feel for how sagittal depth relates to surface power.
Launch AppLens Clock to True Power Conversion
A converter that corrects a lens-clock reading (calibrated for n = 1.53) to the true surface power of lenses made from other materials. It demonstrates the refractive-index correction that students often overlook.
Launch AppHand Neutralization Simulator
An interactive simulator for practicing hand neutralization of ophthalmic lenses. Students can observe parallax movement, rotate the lens to locate the principal meridians, mark the meridians with colored dashed lines, and verify the axis using a 1-degree protractor.
Launch AppLensmeter Simulation
A virtual lensmeter (focimeter) for measuring sphere power, cylinder power, axis, and prism. You focus the mire target, then read the power drum and axis wheel exactly as you would on a real instrument.
Launch AppKeratometer Simulation
A keratometry simulator where you align and focus the mires to measure corneal curvature (K-readings) in the two principal meridians. It builds technique for assessing corneal power and astigmatism.
Launch AppRetinoscopy Simulation
An interactive retinoscopy trainer. You sweep the retinoscope beam and interpret the reflex motion (with, against, or neutral) to determine the objective refraction and reach neutralization.
Launch AppSlit-Lamp Simulation
A slit-lamp biomicroscopy simulator that lets you adjust illumination, beam width, and magnification to examine the anterior ocular structures, reinforcing systematic examination habits.
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