This is a phenomenon that usually happens when you are using a flashlight. It occurs even in situations where you are taking photos in daylight or when the level of ambient light is very high. Taking pictures can be a very intriguing especially in low ambient light scenarios thereby causing redness in the person’s eye.
What actually causes redness? It is quite simple! When flashlight from the camera gets directly into the eyes, it penetrates right deep and is the reflection that comes back from the retina that causes redness in the eye. The reason why the color is red is because the reflected light comes from the red blood in the retina.
In some instances, red-eye can be very evident, while in other cases they cannot be seen to appear. Another cause of red eye can be as a result of the state of the pupil. If there is pupil dilated, then more light is reflected back from the retina and to the eyes, thereby causing redness to appear in the photo.
Common way to reduce red-eye
One of the easiest ways of eliminating red-eye is by simply activating the red-eye reduction feature that is built into the camera. It is very simple to use but the results are far-reaching and very effective. To go about this is to try and shot a series of shoots with pre-flash followed by some strobes before actually taking the photo. These series of pre-flash strobes makes the pupils to actually reduce in size and by the time the picture is taken, the pupils are very small to cause eye redness.
The feature of red-eye reduction actually works perfectly on reducing redness, but it can never be prevented. However, there are many limitations associated with this feature, for instance, the pupil reaction time to light can vary. Furthermore, this feature has some effects like resulting in photos having people with their eyes closed.
Other ways to prevent red-eye
Understanding the primary causes of red-eye can be seen as the first step to actually prevent it from happening. Here are some really simple ways to prevent red-eye other than using the inbuilt camera reduction feature;
You should endeavor to increase the light whenever a photo is about to be taken, causing a person’s pupils to reduce in size and eye redness too.
Avoid pointing the flash towards the eyes rather it should be placed away from the eyes. Usually, red-eye is caused by flashlight that is reflected from the retina, so the best way to prevent it would be just to eliminate the entire reflection as much as possible.
The angle between the flash and the camera lenses is usually very narrow, making it possible for the flash to bounce back from the retina straight to the lenses. Increasing the angle by maybe using an external flash is capable of reducing the reflected light.
Furthermore, you can always use a bounce flash to avoid red-eye. But by making the flashlight to bounce off a bright surface probably a white wall, will make most of the direct reflection from the retina to be eliminated.
Also, you can be able to remove red-eye after the photos have already been taken by using special processing software on your computer. In most digital cameras, you are going to find PC software that embeds this particular feature.
Although this method does not completely eliminate red-eye from the source, it can definitely make a red-eye free photo. Some are much better than others, while others are manual, soma e can be automatic.