To examine these structures of the eye, switch on the slit-shaped lighting of the funduscope. Start the examination at the border, between sclera and cornea. The limbus is where the white of the eye globe becomes the iris [Figure 60-1].
Figure 60-1
When moving the slit beam slowly across the eye globe, from lateral side into the medial direction, you see two small reflections of the light beam. The front one is the reflection of the light onto the cornea [Figure 60-1, a], the back one is the reflection onto the iris [Figure 60-1, b]. As you approach the pupil [Figure 60-2], you will notice that both lines diverge from each other and that the cornea [Figure 60-2, a], exhibits a clear curvature.
Figure 60-2
The distance between these two lines is the image of the anterior eye chamber
[Figure 60-2, d]. An angle forms between these lines [Figure 60-2, f]. When the light beam has reached the pupil [Figure 60-3], a broad structure with a diluted milk colour is visible between the reflection of the light beam on the upper and lower part of the iris [Figure 60-3, b], in the pupil [Figure 60-3, c]. This is the eye lens [Figure 60-3, e].
On the front and back of this broad structure, a fine white border is visible. This is the anterior and posterior lens capsule. In the structure itself, sometimes even fainter vertical white lines are detectable. These are the layers from which the lens is built up.
Figure 60-3
The distance between the first thin white line, the reflection onto the cornea [60-3, a], and front border of the eye lens is the depth of the anterior eye chamber [60-3, d]. This is detected as a broad black line.