Presbyopia

Get the facts! By Jen Plummer

The Eye

Eyes are known as the organs of our vision. With normal vision the cornea is clear, the lens focuses, the muscles contact or relax and the image is the focus of the retina. In eye with Presbyopia the cornea lets light pass though, the lens can’t change its shape and lose focus, the muscles changes shape because the lens hardens and the image is now focusing behind the retina instead of in the front light normal site.

Perception

The perception of vision is when you process the information seen in visible light. “Behind the pupil is the lens, which is similar in shape and function to a camera lens. Together with the cornea, the lens adjusts the focal length of the image being seen onto the back of the eye, the retina. Visual reception occurs at the retina where photorceptor cells called cones and rods give an image color and shadow. The image is transduced into neural impulses and then transferred through the optic nerve to the brain for processing. The visual cortex in the brain interprets the image to extract form, meaning, memory, and contex ” (Vision: The Visuaal Sysyem, the Eye, and Color Vision, 2015). Unified whole are visual elements with certain principles such as similarity, closure, continuation and proximity these are different ways that people see things or objects.

Symptoms

  • Reading small print
  • Reading from a distance or up close
  • Headaches

References

Facts About Presbyopia. (2010, October). Retrieved September 29, 2015, from https://nei.nih.gov/health/errors/presbyopia

“Vision: The Visual System, the Eye, and Color Vision.” Boundless Psychology. Boundless, 20 Aug. 2015. Retrieved 29 Sep. 2015 from https://www.boundless.com/psychology/textbooks/boundless-psychology-textbook/sensation-and-perception-5/sensory-processes-38/vision-the-visual-system-the-eye-and-color-vision-161-12696/