Category:Miscellaneous

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This is the Miscellaneous category.

Smart Phoneography

This article primarily focuses on how to take slit lamp photographs with an iPhone. If you have experience with other smart phones, thank you for sharing your experiences.

Adapters

It is possible to take slit lamp photos by placing the lens of your smartphone flush with the slit lamp ocular; however, the use of an adapter will allow you to obtain higher quality photographs. Below you will find several options. The author of this article only has personal experience with the Keeler adapter.

1. Keeler Portable Slit Lamp iPhone 4 image adapter. The adapter has been reported to be compatible with the following slit lamp models: Haag-Streit 900 series, Topcon SL-3F. It has been reported that the adapter is not compatible with the following slit lamp models: Topcon SL-D7. When using the Keeler adapter, a moderate amount of force has to be applied to attach the adapter to most Haag-Streit slit lamp oculars. It has been reported in the Kera-net listserv that the adapter better fits the older Haag-Streit models.

The Keeler adapter can be purchased by clicking here.

To view Dr. Fogla’s excellent video tutorial on how to take slit lamp photography with the iPhone and Keeler slit lamp adapter click here

2. SteadyPix Telescope Photo Adapter for iPhone. It can be purchased by clicking here.
3. SkyLight. It can be purchased by clicking here.
4. EyePhotoDoc. It can be purchased by clicking here.
5. Tiger Lens. It can be purchased by clicking here.
6. iExaminer. It can be purchased by clicking here.

Apps and Software

To obtain the best photographs possible, you will need to be able to control the exposure, point of focus, etc. For the iPhone, the Camera Awesome app by SmugMug (available in the Apple App Store) works quite well.

The following tips will help you take better pictures with the Camera Awesome app (video forthcoming):
1. Take pictures in “Horizon COMPOSITION” mode in order to reduce over exposure. Once opening the app, you can access this mode by tapping the downward pointing triangle at the very top       and center of the screen.

2. Fill the iPhone viewing screen with your image. There are two options:

  • Adjust the distance between your iPhone’s camera lens and slit lamp ocular until the image fills the iPhone viewing screen. This may be difficult or impossible if your iPhone slit lamp adapter does not allow for such adjustments.
  • Increase your zoom by tapping the bottom of the screen just above the camera icon that is at the very bottom and center of the screen. Zoom in until the image of the image fills the iPhone viewing screen. I recommend using a slit lamp magnification of 10x in order to maintain the best focus.

3. Separate your Focus and Exposure. Once the eye is close to being in focus, tap the center of the screen with two fingers. This will separate your control of the focus and exposure.

4. Place the FOCUS square over your specific point of interest (e.g., superior pannus, temporal infiltrate, etc.).

5. Place the EXPOSE square over the area of the image that is most bleached out due to overexposure.

6. Tap the picture of the icon at the very bottom and center of the screen in order to obtain the image.

General Tips

1. Focus the image through the slit lamp’s ocular then fine-tune the focus through smartphone’s viewing screen. The image you see through the slit lamp ocular will not be the same as the          image that you see through on your smartphone’s viewing screen, especially when you are performing retroillumination.

2. There is a tendency for images to white out due to overexposure. Try using a dimmer light setting on the slit lamp or a diffuser if you have one available.

3. If you are not happy with the image quality when illuminating the eye from the temporal side, move the slit beam to the nasal side (or vice versa). While I generally prefer to examine patients’ eyes with my slit beam positioned to the left, I have found I can obtain better pictures by moving the beam 90 degrees to the right.

4. In my experience, quality images can be obtained with 10x or 16x magnification when using parallelepiped illumination. I have been less successful obtaining quality images when using greater than 10x magnification with diffuse illumination.

Video Tutorials

To view Dr. Fogla’s excellent video tutorial on how to take slit lamp photography with the iPhone and Keeler slit lamp adapter click here.

Picture Examples