Eye Accommodation Explained
The eye's ability to adjust its focus, particularly for viewing near objects, is called accommodation. This process involves the lens changing shape.
Ageing and Accommodation Decrease
As people age, the lens inside the eye becomes less flexible. This natural ageing process leads to a gradual decrease in the eye's power of accommodation, making it harder to focus on close-up items.
Identifying Presbyopia
The specific term for this age-related difficulty in focusing on near objects due to the loss of accommodation is presbyopia. It typically becomes noticeable in individuals over the age of 40.
Differentiating Other Conditions
- Hypermetropia (farsightedness): Difficulty seeing near objects, but can occur at any age and is often due to the eyeball being too short or the lens/cornea having too little focusing power.
- Myopia (nearsightedness): Difficulty seeing distant objects clearly.
- Colour blindness: The inability to distinguish between certain colours.
Based on the definition, the decrease in the power of accommodation with ageing is specifically known as presbyopia.
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