PANTOSCOPIC TILT IN OPHTHALMIC PRACTICE
It is the angle between the plane of the lens/frame front and frontal plane of the face.
Upper 180° of eye wire is farther from the frontal plane of face and the lower 180° of the eye wire is nearer to the frontal plane of face.
This is about 10-12°. This is required for proper relationship of frame front and the eyebrows/cheeks of patient’s face.
It also gives widest view for reading as the vertex distance of the lower half of lens is minimized.
However, this tilt introduces some astigmatism and changes the effective power of the lens.
If the tilt is made in such a way that the upper 180° of frame comes closure to the frontal plane of face as compared to the lower 180°, it is called the retroscopic tilt.
FOLLOW SHARP VISION FOR UPDATES
0 Comments