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Adaptive Smart Study, full 150-question mock licensure tests, and interactive clinical simulators.

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Smart Study

Strengthen your understanding through adaptive practice, guided explanations, and clinically focused questions designed to build lasting knowledge and diagnostic reasoning.

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150-Question Mock Boards

Simulate official PRC OLE board examinations with exact timing, question navigator, and comprehensive topic score reports.

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Clinical Simulators

Build practical clinical skills with interactive simulations that let you explore examination techniques, interpret findings, and apply optometric concepts in a guided environment.

🧠 Smart Study

Continuous clinical question stream with immediate rationale feedback.

Subject

Select a subject above or click Next to begin Smart Study…

Session: 0 ✓ 0 ✗ 0

🔬 Clinical Practice Simulators

Interactive virtual instruments for mastering optometric clinical procedures and examinations.

Virtual Lensmeter (Lensometer) Simulation

Pro Clinical Module

Pro Tip: Hover cursor over the circular eyepiece and use your mouse scroll wheel to dial the Power Drum.

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Practice Setup

Select mode and seed random spectacle lenses

Difficulty Mode:

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Instrument Controls

Adjust the focimeter optical alignment

Power Drum (-20 to +20 D) +0.00 D

Axis Wheel (0° – 180°) 180°

Reticle Crosshair (Red Line) 180°

Lens Stage Alignment (Optical Center):

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Record Findings

Enter your measurement and verify clinical accuracy

Sphere (DS)

Cylinder (DC)

Axis (°)

Prism (Δ)

Prism Base (°)

Conoid of Sturm (3D Astigmatic Optics)

Free Module

Rotate: Left-Drag • Pan: Right-Drag • Zoom: Scroll

Beam Cross-Section Circle of Least Confusion

Width: --

Height: --

Plane Z: --

Interactive 3D: Drag to rotate the conoid in 3D space. Watch the cyan marginal beam boundary collapse into two focal lines and the circular cross-section at the spherical equivalent.

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Astigmatic Lens Parameters

Set dioptric powers along the principal meridians

Power X (Horizontal Meridian) +4.00 D

Power Y (Vertical Meridian) +2.00 D

Cylinder Axis Rotation (0° – 180°) 180°

Clinical Presets:

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Slicing Plane & Focal Navigation

Translate the observation cross-section along the Z-axis

Slicing Plane Position (Z-Axis) 40.0 mm

Snap to Key Optical Positions:

Focal Line 1 (X): 30.0 mm

Circle of Least Confusion: 40.0 mm

Focal Line 2 (Y): 60.0 mm

Interval of Sturm: 30.0 mm (2.00 DC)

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Display & Ray Visibility

Control 3D ray bundles and geometric surfaces

Red Meridian Rays (X Meridian / Horizontal Power) Blue Meridian Rays (Y Meridian / Vertical Power) Cyan Marginal Beam Surface Wireframe Marginal Mesh Display Focal Line Target Markers

Geometrical Ray Tracing (Thin Lenses)

Free Module

Interactive: Drag Amber Arrow to reposition • Lens: Center (0,0)

Interactive Thin Lens: Solid lines represent physical refracted rays moving left-to-right. Dashed lines indicate virtual back-traced extensions meeting at virtual conjugate image foci.

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Lens & Object Parameters

Configure lens curvature, focal length, and object placement

Lens Type:

Focal Length (|f|) 100 mm (+10.00 D)

Object Distance (d_o) 180 mm

Object Height (h_o) 60 mm

Conjugate Focus Presets:

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Image Analytics & Properties

Real-time Gaussian conjugate calculations and magnification

Real Image Inverted Magnified

Image Dist (d_i): +225.0 mm

Image Height (h_i): -75.0 mm

Magnification (M): -1.25×

Lens Diopters: +10.00 D

Gaussian Thin Lens Equation:

1/d_i = 1/f − 1/d_o = 1/(100) − 1/(180) → d_i = +225.0 mm

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Principal Rays & Display

Show or hide the canonical cardinal ray paths

Ray 1 (Parallel / Red): Parallel to axis → refracts through/from focus Ray 2 (Center / Green): Undeviated straight through optical center (0,0) Ray 3 (Focal / Blue): Aimed at/through focus → refracts parallel to axis Virtual Extensions: Dashed backward extensions for virtual conjugate foci Coordinate Grid: Background Cartesian millimeter scale

Manual Keratometer (Ophthalmometry)

Corneal Curvature, Principal Meridians & Doubling Mire Alignment

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Clinician Eyepiece View

Observe corneal reflections and alignment of the three doubling mires

Stage: Centered

Focus: Sharp

Keyboard Controls: WASD Position • ↑↓ Focus • ←→ Axis • Sliders K1/K2 Drums

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Practice Setup & Cornea

Mount a virtual cornea with authentic anterior astigmatic curvature

Clinical Difficulty:

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Instrument Positioning & Focus

Manipulate joystick stage translation and ocular focusing knob

Joystick Stage Positioning (X / Y) X: 0 px, Y: 0 px

Ocular Focusing Knob (Forward / Backward) 50 (Sharp)

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Barrel Axis & Power Drums

Rotate keratometer barrel and dial horizontal / vertical diopter drums

Barrel Axis Rotation (0° – 180°) 180°

Horizontal Drum — K1 (Overlap ‘+’ Spurs) 43.00 D

Radius of Curvature (r₁): 7.85 mm

Vertical Drum — K2 (Overlap ‘−’ Spurs) 44.00 D

Radius of Curvature (r₂): 7.67 mm

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Record Findings & Clinical Tolerance

Evaluate your measurement accuracy against PRC / ANSI Z80 standards

Streak Retinoscopy Simulation

Pro Clinical Module

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Retinoscopic Reflex

Sweep pointer across the eye to observe pupillary motion

UNLOCKED

Click to lock beam

Streak: 90° • Meridian: 180° • Reflex: WITH • Speed: Normal

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Streak Rotation (Sleeve)

Examined Meridian: 180° (Horizontal)

90° SLEEVE

Drag dial or click buttons to rotate retinoscope beam

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Practice Setup & Mode

Select mode, presets, or generate randomized patient cases

Mode:

Clinical Presets:

Fixating Eye:

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Patient Refraction (True Rx)

The patient's true distance refractive state

Patient Sphere −1.25 D

Patient Cylinder −0.50 D

Patient Axis 170°

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Trial Lenses (Phoropter Head)

Examiner neutralizing lenses

Trial Sphere 0.00 D

Trial Cylinder 0.00 D

Trial Axis 180°

Gross in examined meridian: Gross: 0.00 D

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Working Distance & Analysis

Focal distance compensation and live optical analysis

+1.49 D WD

Working Distance (40–100 cm) 67 cm (26.4")

40 cm (+2.50 D) 50 cm (+2.00 D) 67 cm (+1.50 D) 100 cm (+1.00 D)

WITH MOTION Streak @ 90° | Sweep @ 180°

Reflex moves with the streak. Far point is behind examiner. Add PLUS (or reduce Minus).

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Net Refraction (Your Answer)

Deduct working distance power from your gross finding

Net Sphere (D)

Net Cylinder (D)

Axis (°)

Slit Lamp Biomicroscopy Simulation

Pro Clinical Module

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Biomicroscope Examination View

Adjust illumination and filters to examine the anterior segment

Right eye, corneal surface, white light, 45° illumination, medium beam.

Educational Simulator: This is a 2D educational approximation. Beam angle, width, height, and filter selection produce visual changes on a simplified ocular model. True stereoscopic depth perception is not reproduced on a flat screen.

Examination Type:

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Clinical Case

Select a guided lesson or clinical examination case

Active Case:

Examination Mode:

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Beam & Illumination Controls

Adjust slit beam geometry and illumination angle

Illumination Angle (0° – 90°) 45°

Beam Width (Slit Aperture) 20%

Beam Height (Vertical Extent) 60%

Illumination Intensity 70%

Filter Selection:

Focal Depth Layer:

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Clinical Assessment

Identify the finding and submit your interpretation

Adjust the beam and filter settings, then identify the clinical finding.

Your Finding:

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Van Herick Case

Assess peripheral anterior chamber depth

Active Case:

Examination Mode:

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Technique Parameters

Beam positioned at the peripheral limbus

Eye Right (OD)

Limbus Temporal

Illumination 60°

Beam Narrow vertical slit

Clinical Note: The Van Herick technique estimates peripheral anterior-chamber depth and helps screen for potentially narrow angles. It does not directly measure the angle and does not replace gonioscopy or clinical evaluation.

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Angle Assessment

Compare anterior chamber depth with corneal thickness

Compare the peripheral anterior-chamber depth (dark gap) with the adjacent corneal thickness (bright section). Select the observed ratio and Van Herick grade.

Observed Ratio (ACD : Corneal Thickness):

Van Herick Grade:

Phorometry Core Examination

Pro Clinical Module

0 of 6 Tests Completed

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Select a Test

Choose a phorometry test from the right panel to begin

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Examination Steps

Select a phorometry test (7 tests)

Mode:

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Patient Case

Load a test to view case details

Select Case:

Cover Test (Strabismus Assessment)

FREE

Practice unilateral cover-uncover and alternating cover testing to differentiate tropias from phorias.

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Clinical View (Facing Patient)

Patient fixating distant target (6 m / ∞)

Patient Right (OD)

Patient Left (OS)

● DRAG TO COVER

👁 Patient is fixating on a distant target. Drag the occluder over an eye or click a button to begin.

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Select Condition (Learn Mode)

Choose a clinical presentation to observe pupil kinematics

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Study Notes & Clinical Code

Diagnostic principles for the active case

ORTHO

Error of Refraction Simulation

FREE

Explore conjugate foci, retinal image blur, and trial lens neutralization for Emmetropia, Myopia, Hyperopia, and Astigmatism.

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Ocular Ray Cross-Section & Focus

Parallel incident rays from optical infinity (6 m / ∞)

Patient View

F P

T O Z

✔ Light focuses directly on the retina. The image is clear and sharp.

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Select Condition (Learn Mode)

Choose a clinical presentation to observe focal planes

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Ocular Anatomy & Power

Adjust physiological parameters

Axial Length (mm) 24.0 mm

Corneal Refracting Power 43.00 D

Total Eye Power

60.00 D

Far Point (M_R)

∞ (Infinity)

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Corrective Trial Lens Rack

Neutralize refractive error at spectacle plane (d = 12 mm)

EMMETROPIC

Trial Sphere Power 0.00 D

Trial Minus Cylinder Power 0.00 D

Trial Cylinder Axis 180°

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Study Notes & Clinical Pearls

Optometric principles for the active condition

Test	Expected
Distance Phoria	1Δ Exo ± 2
Near Phoria	3–6Δ Exo ± 3
Distance BO (PFV)	9 / 19 / 10
Distance BI (NFV)	x / 9 / 5
Near BO (PFV)	17 / 21 / 11
Near BI (NFV)	13 / 21 / 13

Klaro PH — Licensure Mock Boards

Optometry Board Exam Practice

Official timed mock exam simulation for optometry board examinees. Pick a subject below to configure your test.

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Disclaimer: Questions are compiled from board exam reviewers and validated with PRC optometry curriculum standards.

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Question 1

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PASSED

8 / 10 correct

Subject Name

Correct

Incorrect

Unanswered

5:32

Time

Pass the PRC Board Exam with Klaro PH

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Smart Study

150-Question Mock Boards

Clinical Simulators

🧠 Smart Study

🔬 Clinical Practice Simulators

Virtual Lensmeter (Lensometer) Simulation

Practice Setup

Instrument Controls

Record Findings

Conoid of Sturm (3D Astigmatic Optics)

Astigmatic Lens Parameters

Slicing Plane & Focal Navigation

Display & Ray Visibility

Geometrical Ray Tracing (Thin Lenses)

Lens & Object Parameters

Image Analytics & Properties

Principal Rays & Display

Manual Keratometer (Ophthalmometry)

Clinician Eyepiece View

Practice Setup & Cornea

Instrument Positioning & Focus

Barrel Axis & Power Drums

Record Findings & Clinical Tolerance

Streak Retinoscopy Simulation

Retinoscopic Reflex

Streak Rotation (Sleeve)

Practice Setup & Mode

Patient Refraction (True Rx)

Trial Lenses (Phoropter Head)

Working Distance & Analysis

Net Refraction (Your Answer)

Slit Lamp Biomicroscopy Simulation

Biomicroscope Examination View

Clinical Case

Beam & Illumination Controls

Clinical Assessment

Van Herick Case

Technique Parameters

Angle Assessment

Phorometry Core Examination

Select a Test

Examination Steps

Patient Case

Clinical Instructions

Risley Prism

Record Endpoints

Evaluation & Feedback

Attempt Summary

Cover Test (Strabismus Assessment)

Clinical View (Facing Patient)

Select Condition (Learn Mode)

Study Notes & Clinical Code

Clinical Interpretation

Interpretation Feedback

Error of Refraction Simulation

Ocular Ray Cross-Section & Focus

Select Condition (Learn Mode)

Ocular Anatomy & Power

Corrective Trial Lens Rack

Study Notes & Clinical Pearls

Clinical Diagnostic Quiz

📚 Phorometry Core Examination Guide

Overview

Phoria Tests (Von Graefe Technique)

Vergence Tests (Smooth Vergences)

Morgan’s Expected Norms

Klaro PH — Licensure Mock Boards

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Performance by Topic

Question Review

Attempt History

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How to Use the Manual Lensometer

Optics Guide: The Conoid of Sturm

Optics Guide: Geometrical Ray Tracing