Ideal Hinge Position in Astigmatic Eyes

Axial / Sagittal Curvature (Front) · Hinge parallel to the cylinder axis of the subjective refraction · Teaching simulation
−3.00 D
−3.00 D
162°
Rx: −3.00 −3.00 × 162°
ODRight

Subjective Refraction

Sphere:−3.00 D
Cylinder:−3.00 D
Axis (cyl):162°
Minus-cyl form:−3.00 −3.00 × 162°
SEQ:−4.50 D

Cornea Front

K1:42.0 D @ 162°
K2:45.0 D @ 72°
Km:43.5 D
Astig:3.0 D
Axis (steep):72°

Notes / Comments

Hinge is derived from the subjective refraction, not from the K readings: the ablation zone is elongated along the minus-cylinder axis, so the hinge is placed parallel to that axis, outside the long side of the ablation.

Axial / Sagittal Curvature (Front)

DCurvature
Abs
SphereCylinderAxis (cyl) Steep K (K2)Flat K (K1)Astig Hinge meridian
−3.00 D −3.00 D 162° 45.0 D 42.0 D 3.0 D 162°
Simulation for teaching purposes · Corneal map assumes corneal astig ≈ refractive cyl (simplified) · Refractive Planning Suite Dr. med. Harald C. Gäckle · refractiveplanning.tools