Optic Nerve and Nerve Fibre Layer Examination
Examination of the optic nerve is essential to detect glaucoma or determine whether glaucoma damage is stable (Figure 7). Progressive change in the appearance of the optic nerve indicates that the disease is worsening. If the appearance of the optic nerve is unchanged, this indicates that the glaucoma is most likely stable and under control.
Although a hand-held instrument, known as an ophthalmoscope, can be used, the use of the slitlamp with a special lens allows a three dimensional examination of the optic nerve.
Your doctor observes the optic nerve and assesses its shape and colour. Most doctors draw a picture in the patient's chart for future reference. In addition, photographs of the optic nerve may be obtained. Future examinations of the optic nerve can then be compared to the initial drawing or photographs to detect changes in shape or colour. This is an examination that should be performed at least once or twice yearly.
