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Ophthalmology

Ophthalmology Ophthalmology

ARMD and Visual Fatigue

As with the other senses, sight deteriorates with age. For instance, visual fatigue or aesthenopia are common in people performing excessive eye work, and age-related macular degeneration (ARMD) is the second most common cause of blindness in people over 50 years of age in Western countries. 

The vision process

Both disorders affect the visual system. In the vision process, light stimuli will be transformed in the retina into electrical impulses, which will be transmitted to the brain via the optic nerve, where they will be processed in the visual cortex. The retina contains two types of nerve cells - rods and cones.

 

In the central part of the retina, the macula, there is the area of the eye with greatest visual acuity, the fovea, formed only by cones. Around it and as we move further away from it, the cones become scarcer and the rods are present. Cones are responsible for photopic vision or colour and details (central vision). Rods are in charge of scotopic vision or black and white vision (peripheral vision).

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