OM t of c.iii - Vision Research Coordinating Center - Washington ...

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2/22/96 Chapter 11 Corneal Photography page 11-2 • Instruct patient to look at Cornea Photographer’s right earlobe. • Place the right edge of the parallelepiped (Pp) in the center of the pupil. • Center the eye in the field of view vertically • Focus carefully on the tear film. • Instruct the patient to open wide and take 2 photographs. • Notice where the left edge of the first parallelepiped is, and place the right edge of the second parallelepiped at this point (Pp2 is 1 mm left of the Pp1). • Tell the patient to close his or her eyes. Expose one frame. • Take 2 photographs. NOTE: Sometimes on this photo, the corneal reflex (Purkinje image 1) is on top of the second parallelepiped; if this occurs, have the patient fixate slightly to the left (nasal) so that this tear reflection moves just to the left of the location of Pp2. • Move the light tower to 45 degrees nasal to the microscope. • Place the left edge of Pp3 in the center of the pupil and position the eye in the center of the field of view vertically • Focus on the tear film and instruct the patient to open his or her eyes wide. • Take 2 photographs of Pp3. • Tell the patient to close his or her eyes. Expose one frame. • Move the slit lamp 1 mm nasal and take 2 photos of Pp4. • Photograph the bridge of the nose. • Proceed to the left eye and follow the above procedure with the patient fixating the Cornea Photographer’s left earlobe. 4) OBLIQUE PHOTOGRAPHS (Obl T and Obl N). • After full dilation of pupil, open the slit beam to full horizontal and vertical dimensions. (Note: topical corneal anesthetic can be instilled before the mydriatic drops, but it is not required.) • Put the neutral density filter in place and move the background illuminator intensity to off. • Change the flash intensity to 5 and the magnification to 25X. • Place the light tower 50 degrees temporal. • Position the patient for comfort. • Focus on the central tear film and ask the patient to fixate the Cornea Photographer’s right earlobe and to open his or her eyes wide. • Take 2 photographs. • Move the light tower to 30 degrees nasal. • Take 2 photographs. • Photograph the bridge of the nose. • Move to the left eye. • Repeat the steps above for left eye with patient fixating the Cornea Photographer’s left earlobe.
2/22/96 Chapter 11 Corneal Photography page 11-3 NOTE: If patient blinks during any of the above photographs, retake that specific photograph. If you need extra film, use the 24-exposure roll used for the corneal oblique and First Definite Apical Clearance Lens photographs.
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OM t of c.iii - Vision Research Coordinating Center - Washington ...

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