How does Scheimpflug imaging work?

The rotational Scheimpflug camera takes up to 50 cross-sectional images on an angle from 0 to 180° in a single scan, acquiring 25 000 data points in approximately 2 seconds. The second camera is static and used to monitor eye fixation and detects pupil size.

What is the plane of focus?

The plane of focus is a two-dimensional ‘plane’ in front of the camera at the point of focus. This plane will give you the sharpest focus at a particular depth of field. This is an imaginary plane and lies parallel to the camera sensor, (unless using a something like a tilt-shift lens.

What is tilt-shift in camera?

A tilt-shift lens (also called a perspective control lens) changes the position of a lens in relation to a camera’s image sensor. When the lens shifts, it recenters the image entering your camera, allowing you to take photos from what appear to be different vantage points without moving the camera body.

What is the focal plane of a lens?

Definition of focal plane : a plane that is perpendicular to the axis of a lens or mirror and passes through the focus.

How is forme Fruste keratoconus diagnosed?

The diagnosis of forme fruste keratoconus is topographic. I use patterns of topography that have been described by Rabinowitz1 and Binder et al2 to diagnose forme fruste keratoconus. These patterns include inferior steepening and asymmetric bow ties with a skewed radial axis.

What is corneal topography used for?

Corneal topography produces a detailed, visual description of the shape and power of the cornea. This type of analysis provides your doctor with very fine details regarding the condition of the corneal surface. These details are used to diagnose, monitor, and treat various eye conditions.

Why is focal plane important?

One of the most important aspects, when you buy a lens, is the focal length. This lets you know how close you need to be in relation to the subject you are capturing. A longer focal length is necessary for objects further away. A smaller focal length captures more of the scene in front of you.

What is the effect of tilt shift?

The tilt effect alters the focal plane of the image, but the shift effect alters an image’s perspective. With the Shift knob, you can move the lens up and down or side to side on the body of the camera. As the lens moves, the image plane moves too, so that the sensor records different areas of the total image.

Why is it called tilt shift?

Sometimes the term is used when a large depth of field is simulated with digital post-processing; the name may derive from a perspective control lens (or tilt–shift lens) normally required when the effect is produced optically.

What is aperture of lens?

An Aperture is the opening within a lens that controls how much light hits the imaging sensor. Think of it as the pupil in your eye. The size of the aperture will dictate two things; firstly, your depth of field and secondly, the shutter speed required to expose the image correctly.

What is back focal plane of objective lens?

The back focal plane of the objective lens is on the inside of the microscope. Many important images and objects are located at the objective’s back focal plane: the Fraunhofer diffraction plane, the Fourier transform of the image, the image of the filament, and the image of the aperture iris.