Retina News

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.

Restoring Vision with Viruses and Gene Modifications

Submitted by laurenplozano on Tue, 01/16/2018 - 11:59

Visual researchers remain hard at work in their quest to find treatments for the various diseases and mutations that cause blindness. Recent techniques involve inserting light-sensitive proteins into the damaged retina via gene therapy, and using a virus to do so. This may be a surprise to many people as viruses are typically thought of as harmful entities to avoid; yet they can actually work to our advantage and may even be the beginning to treating some forms of blindness.

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. 

How Do Your Eyes Get Their Color?

Submitted by spertsovsky on Wed, 12/13/2017 - 15:26

      Today, it is estimated that there are about 7 billion human beings living on the Earth, and the exact number is constantly growing. While there is incredible diversity between those billions of people, such as race, religion, sexuality, and general physical appearances, there is much variation between people’s eye color as well.

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.