Central fovea

The central fovea, also known as the foveola, is the very smallest area in the centre of the fovea. The fovea itself is the central part of the macula on your retina, and the central fovea forms its core. This area measures only about 0.35 millimetres in diameter, which corresponds to approximately 1 to 1.5 degrees of your field of vision.

The central fovea contains only cones, the photoreceptors responsible for sharp vision and colour perception. Here, the cones are packed most densely together and have the most direct connection to the nerve cells that send signals to your brain. All other layers of the retina have been removed here, so that light can reach the cones virtually unimpeded.

Due to its unique structure, the central fovea is the point where your vision is sharpest. Whether you’re reading a letter, recognising a face or trying to thread a needle, you’re using this small area. Everything you see outside the central fovea is less sharp, although you often don’t notice this in everyday life because your eyes are constantly moving to bring objects into this area of sharp focus.

The central fovea is vulnerable. Because the area is so small and so important for your central vision, damage to this part of the retina can have a major impact on your eyesight. Conditions affecting the macula or fovea, such as macular degeneration, can therefore significantly affect your ability to read or recognise faces.

Why the central fovea is so important

Although the central fovea covers only a fraction of your retina, it occupies a disproportionately large part of your visual cortex. Your brain allocates far more processing power to the information coming from this small area than to the rest of your field of vision. This explains why you can see so clearly in the centre of your field of vision, whilst your peripheral vision shows much less detail.

Contact lenses and the central fovea

For people with refractive errors such as short-sightedness, long-sightedness or astigmatism, it is important that contact lenses focus light precisely on the central fovea. A well-fitting lens with the correct prescription ensures that the image is sharply focused in this area. In the case of multifocal or varifocal lenses, the design is such that different zones of the lens direct light towards the central fovea for different distances.

Check-ups and health

During an eye examination, the optician or ophthalmologist often looks specifically at the central fovea to assess the health of your retina. With modern equipment such as OCT scans (optical coherence tomography), the structure of this area can be examined in detail. If you have any concerns about your central vision, such as distorted lines, dark spots or reduced sharpness, please have this assessed by your optician, optometrist or ophthalmologist.