Optical coherence tomography of the anterior segment in secondary glaucoma with corneal opacity after penetrating keratoplasty.
OBJECTIVE
To evaluate secondary glaucoma after penetrating keratoplasty with anterior-segment optical coherence tomography (OCT).


METHODS
Case series.


METHODS
Four eyes of four patients with corneal opacity and increased intraocular pressure (IOP) were evaluated using high-speed (2000 axial scans/s) OCT at 1.3 microm wavelength. Cross-sectional images of the anterior segment were analysed to assess the cause of increase in pressure.


RESULTS
Slit-lamp evaluation of the anterior chamber in all cases was limited by corneal opacity. The OCT imaging allowed visualisation of anterior-segment structures behind the opaque corneas. Using OCT, iris-intraocular lens adhesion and pupillary block were identified as the probable reasons for the increased IOP in one case. Peripheral anterior synechiae and angle closure were identified in the three remaining cases. In two cases, we found that the tip of the aqueous drainage tube was blocked by peripheral anterior synechiae.


CONCLUSIONS
OCT is similar to ultrasound in that it allows visualisation through opaque corneas. However, OCT has an advantage in that it requires neither contact nor immersion. It is a valuable tool for evaluating the depth of the anterior chamber angle and the causes of secondary angle closure.
Memarzadeh
Farnaz
F
Doheny Eye Institute and Department of Ophthalmology, Keck School of Medicine, University of Southern California, 1450 San Pablo Street, DEI5702, Los Angeles, CA 90033, USA.
Li
Yan
Y
Francis
Brian A
BA
Smith
Ronald E
RE
Gutmark
Julie
J
Huang
David
D
D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000473:pathology*; D003318:Corneal Opacity / Q000150:complications*; D015812:Glaucoma, Angle-Closure / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D015948:Keratoplasty, Penetrating / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D041623:Tomography, Optical Coherence