Free Canthal Tilt Test: Exact Eye Angle Protractor

Canthal Tilt Test Degree Chart: Positive, Neutral & Negative

Compare your degree measurement from the craniofacial geometry scan with standard oculoplastic and portrait styling classifications:

How Our Roll-Calibrated Canthal Tilt Test Eliminates False Readings

Canthal tilt describes the angular inclination of a line drawn from your medial canthus (inner tear-duct corner, landmarks #133 and #362) to your lateral canthus (outer eye corner, landmarks #33 and #263). On basic ruler websites, tilting your head just 3 degrees to the left makes one eye read artificially positive and the other negative. Our automated anatomical contour evaluation mathematically subtracts overall head roll using your inter-canthal baseline before measuring each eye's true anatomical inclination.

Within seconds of selecting a photo or enabling live webcam tracking, the facial ratio analysis plots precision cyan vectors across both eyes and averages left and right degree readouts. You can also check your Eye Separation Ratio (ESR) alongside orbital angle without sending a single image byte outside your browser.

Why Camera Pitch Changes Your Canthal Tilt Test Result

Even with roll calibration, vertical camera pitch dramatically alters apparent eye inclination! Holding your phone above eye level and looking up foreshortens upper eyelids and raises outer corners, adding +2° to +3° to a biometric landmark check. Conversely, holding your phone low and tilting your chin up flattens or lowers lateral corners.

For clinical baseline consistency, place your camera lens directly at eye height, relax your forehead muscles (raising eyebrows slightly alters skin fold perception without moving the ligamentous canthus), and face soft front lighting. Then use your structural proportion readout reading to pick eyebrow tail tapering and eyewear top-bar geometry that flatters your natural orbital bone structure.

Every craniofacial geometry scan runs 100% client-side inside your web browser. Test multiple camera angles or glasses styles privately and download your complete geometric card in one click.

Orbital Ligament Anatomy, Head-Roll Math & Brow-Frame Geometry

Separating True Anatomical Tilt From Head Roll and Camera Pitch

In oculoplastic anatomy—see medial and lateral canthal tendon structure—canthal inclination measures the angle between the inner tear-duct commissure and outer eyelid junction relative to the true horizontal plane. Without mathematical roll compensation, cocking your head two degrees while snapping a selfie adds +2° to one eye and subtracts 2° from the other. Our solver first computes the inter-medial-canthal vector to establish an exact 0.0° horizon before measuring each eye's elevation.

Eyebrow Tail Grooming & Optical Top-Bar Counterbalance

• Neutral or Negative Tilt (<+1.0°): Clean up downward-growing hairs beneath the outer third of the eyebrow tail and select browline, subtle cat-eye, or upward-swept wayfarer frames that guide the viewer's eye upward.
• Strong Positive Tilt (+4.5° to +8.0°): Maintain clean horizontal or softly structured straight brows and test geometric or rimless eyewear that showcases natural orbital angularity without over-sharpening.

Frequently Asked Questions

Explore All Specialized Craniofacial Calculators