Retina Background

Heterochromia Iridis

Submitted by lianarh on Fri, 01/19/2018 - 11:33

Heterochromia Iridis describes a condition in which there are different colors within the iris of an individual’s eye. This is caused by an excess or lack of production of pigmentation in the iris, which is called hyperplasia and hypoplasia, respectively. There are three main types of heterochromia, in which the pigmentation abnormality appears in different regions of the iris. There is central heterochromia, in which there is a ring of color surrounding the pupil that is a different color than the rest of the iris.

New Treatment for Age Related Macular Degeneration

Submitted by keerthikurian on Tue, 12/19/2017 - 00:23

Age related macular degeneration (AMD) is characterized by a loss of central vision. As a person gets older, they are more at risk of getting AMD. While AMD has no known cure, there are treatments to slow its progress, one being a monthly injection administered directly into the eye.

This injection into the eye delivers the Anti-VEGF treatment to the back of the eye with a thin needle. Anti-VEGF drugs are the medications that are currently being used to treat AMD. They are a group of medicines that reduce new blood vessel growth on the retina. 

Eye Evolution

Submitted by keerthikurian on Sat, 12/09/2017 - 00:04

Due to the fact that a majority of life on earth depends on the sun for energy, it makes sense that many organisms have evolved to respond to light. 

Initially, single celled organisms developed chloroplasts- which is what plants use to convert sunlight into oxygen.  They had this structure called a light spot, which was activated when they were in light (light=food). This also allowed for the production of beta carotene- which is a compound that is essential to the production of retinal for the rhodopsin that would eventually evolve. 

Receptive Fields

Submitted by lianarh on Fri, 12/08/2017 - 17:32

A receptive field of a neuron is the range of stimuli, both the type and the location of stimuli, that best affects the activity of said neuron. The cells in your eyes all respond to a specific wavelength of light, and furthermore their response to this light differs depending on where the light hits them.

Symbiosis: An Exhibit of Biological Art

Submitted by lianarh on Wed, 11/15/2017 - 14:02

At the University of Arizona, the Neuroscience and Cognitive Science student organizations plan a biological art exhibit, featuring artwork from university students, faculty, and the Tucson Community. This event is a harmonious combination of art  and science, celebrating the fusion between the two fields. This year the event, called Symbiosis, featured over 90 pieces of art inspired by biology, expressing a wide range of artistic talent. Several pieces were homages to the Arizona Retina Projects’ favorite biological topic; the eyes.

A Day Eating with Our Eyes in Mind- Recipes for Our Eyes

Submitted by pazm1 on Wed, 11/08/2017 - 14:12

Hey everyone! So a couple weeks ago we told you about the benefits of eating certain foods to maintain healthy eyes. Today here are some recipes to make yourself a day’s worth of meals that is designed to keep your eyes healthy and well. If you are interested in child friendly meals check out our kids section for some ideas that children will like to eat!

Breakfast: Cereal

Lunch: Egg salad sandwich with a side of carrots and a peach

I Spy With My Little Eye- Hallucinations and Visual Impairments

Submitted by pazm1 on Mon, 10/23/2017 - 17:17

               Have you ever thought you have seen something, but then when you turn your head again the image is gone? Hallucinations are when you see simple images such lights, lines or shapes or complex images such as scenes, people, and animals that are not actually there. They occur because the visual cortex, or the part of your brain that allows you to see images, is becomes activated with no input from your eyes and tells you that it is seeing something.

Visual Prosthesis Part Two

Submitted by lianarh on Sun, 10/22/2017 - 16:02

Glasses, contacts, and intraocular lenses can correct a variety of issues, as discussed in Visual Prosthesis Part One. There are other areas in the visual pathway where damage can result in visual impairment. More advanced technologies may be required to help correct them. Some examples of these technologies include retinal implants, BrianPort, and vOICe.