Fig. 4. The camera aperture is to the left and the light for the flash and illumination to the right.
2. The “Camera Awesome” App
Fig. 2. Smartphone is held close to the eye of the horse similar to a direct ophthalmoscope.
These light-emitting diodes (LEDs) are unfortu- nately very bright such that adjunctive methods are needed in some cases to reduce the illumination intensity.
The “Camera Awesome” appa is compatible with iPhoneb and iPadc and recently released a version for Android phones. It is simple to use and allows the veterinarian to obtain both photographic images and videos of the horse eye. Some selective editing is possible. It does not allow dimming of the illu- mination beam such that a diffuser must be utilized (Figs. 4 and 5). Camera Awesome is easy to use, and this starts with the main interface. Most of the screen is given to image space with the vitals hidden away, easily accessed with a single touch. Unlike the default camera app that comes with
the iPhone, Camera Awesome allows for separate focus and metering points (Figs. 6–8). This is sim- ilar to using the exposure or focus lock on a digital single lens reflex camera and recomposing, without the need to recompose. Tapping the screen will recombine the focus and metering points. If you want to return the focus and metering points to the middle of the screen, a double tap anywhere will do. On the video side, the controls are fairly simplistic
and the Awesomize feature is not available. But the camera does have the ability to prerecord for five seconds before you hit the record button. This is useful if you are trying to get a horse to stand still. The video also allows for splitting focus and light metering and will adjust these during recording,
Fig. 3. The retina and optic disc in this horse were imaged with an iPhone 4s smartphone and the Camera Awesome app in video setting. The pupil was dilated with tropicamide and the room lights dimmed. The illumination light was partially blocked with a small piece of elasticon tape, the camera moved to within two centimeters of the cornea, and the video capture started. I emailed the video to my computer and used Microsoft Live Movie Maker to capture the image.
2 2014 Vol. 60 AAEP PROCEEDINGS
Fig. 5. A piece of bandage tape acts as a diffuser to lower the brightness.
