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Optovue OCT

Optovue OCT 3D DiscThe Optovue OCT uses a laser to provide accurate information to diagnose and monitor disease progression of the retina, detect and evaluate glaucoma and assess the anterior segment. The Optovue OCT currently in use, uses Fourier Domain optical coherence technology which is very fast and accurately creates 3D images of the structures scanned.

 

 
Retinal scans

Full thickness retina maps, aid in the diagnosis of diseases such as age related macular degeneration, cystoid macular oedema and diabetic retinopathy. The sensory retina consists of an inner and outer retina. The inner retina is made up of the internal limiting membrane, nerve fibre layer, ganglion cell layer, inner plexiform layer and inner nuclear layer. The outer retina is made up of outer plexiform layer, outer nuclear layer, external limiting membrane, photoreceptor layer and retinal pigment epithelium. The versatility of the OCT is that it allows the healthcare practioner to compare the patients retinal layers against a normative database and monitor the progression of the disease especially in cases where the patients have retinal diseases like age related macular degeneration or diabetes. 

Optovue OCT Retinal

Glaucoma scans

The OCT provides extensive information with regards to the thickness of the ganglion cell complex, the optic nerve head and retinal nerve fibre layer. 

The 3 components that encompass the retinal ganglion cell layer are:
  1. The retinal nerve fibre layer consisting of ganglion cell axons. 
  2. The ganglion cell layer made up of ganglion cell bodies. 
  3. The inner plexiform layer made up of ganglion cell dendrites. 
Glaucoma causes the ganglion cells to die resulting in the ganglion cell complex thinning out. The ganglion cell thickness can be analysed using deviation and significance maps which show the percentage loss from normal and statistically significant loss.
A baseline can be created for each eye and a change report generated for future visits. The colored coded maps compare the patient’s data with extensive normative data which takes into consideration the patient’s age, gender and race.

Cornea scans

A camera lens used in conjunction with the OCT provides anterior segment scans. A variety of scans can be performed to evaluate pachymmetry (corneal thickness) and measure the anterior chamber (distance from the cornea to the iris). Pachymmetry measures corneal thickness within a 6mm diameter and indicates the region of minimum thickness, which is important for patients with keratoconus. 

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