Optical coherence tomography (OCT) provides high resolution objective and quantitative measurements of the optic disc parameters and RNFL thickness and has been widely used for detection of glaucomatous damage and disease progression. The recent introduction of spectral domain (SD)-OCT technology, also known as Fourier domain (FD)-OCT offers significant advantages over the previous time domain (TD)-OCT, allowing 3 D imaging of the retina and optic disc with ultra-high acquisition speed and ultra-high resolution. The higher resolution of (SD)-OCT offers enhanced visualisation and improved segmentation of the retinal layers, providing a higher accuracy in identification of subtle changes of the optic disc and RNFL thinning associated with glaucoma.