Presbyopia

Vision Disorder

Vision

What is presbyopia?

Presbyopia is farsightedness caused by loss of elasticity of the lens of the eye, occurring typically in middle and old age(Goldstein, 2014)

What causes Presbyopia?

Presbyopia is caused by age. This differs from other visual problems such as astigmatism, nearsightedness and farsightedness which are related to the shape of the eyeball and are caused by genetic and environmental factors. The eye's lens stiffens with age, so it is less able to focus when you view something up close.

What age does Presbyopia start?

Presbyopia usually occurs beginning at around age 40. If your 40 or older you have probably started experiencing blurred near vision when reading, sewing or working on a computer.

vision cont'd

These changes occur within the proteins in the lens, making the lens harder and less elastic over time. Age changes also take place in the muscle fibers surrounding the lens. With less elasticity, the eye has a harder time focusing up close. You see vision is one of our important senses people need sight to perform most daily activities. However vision would not exist without the presence of light. According to Goldstein, 2014 Visual information travels from the eye to the brain as follows:

· Light reflected from an object hits the retina’s rods and cones.

· Rods and cones send neural signals to the bipolar cells.

· Bipolar cells send signals to the ganglion cells.

· Ganglion cells send signals through the optic nerve to the brain.

Gestalt psychologists described several principles people use to make sense of what they see. These principles include figure and ground, proximity, closure, similarity, continuity, and simplicity (Goldstein, 2014).

You see, you can't escape presbyopia even if you've never had a vision problem before. People who never wore glasses or had a problem with their vision will eventually notice that their vision will start to blur. Gregory, 2000, states in order to process information we all are equipped with sense organs. Each sense organ is part of a sensory system which receives sensory inputs and transmits sensory information to the brain (Gregory, 2000)

Reference

Goldstein, E. B. (2014). Sensation and perception (9th ed.). Belmont, CA: Wadsworth.

Gregory, R. (2000). The Intelligent Eye. London: Weidenfeld and Nicolson.

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