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

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.