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Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma.

Mizoguchi T, Ozaki M, Wakiyama H, Ogino N - Clin Ophthalmol (2015)

Bottom Line: A-scan biometry was used to measure anterior segment parameters.The mean (standard deviation) ages of PAC and PACG patients and normal controls were 73.5 (6.2) and 72.6 (7.3), respectively.Based on UBM criteria, plateau iris was found in 16 eyes (17.6%) of 91 eyes.

View Article: PubMed Central - PubMed

Affiliation: Mizoguchi Eye Clinic, Nagasaki, Japan.

ABSTRACT

Purpose: To determine the prevalence of plateau iris in Japanese patients with primary angle closure (PAC) and primary angle closure glaucoma (PACG) and analyze the biometric parameters in patients with plateau iris using ultrasound biomicroscopy (UBM).

Methods: In this cross-sectional observational study, subjects aged >50 years with PAC and PACG who had previously undergone a patent laser peripheral iridotomy underwent UBM in one eye. UBM images were qualitatively analyzed using standardized criteria. Plateau iris in a quadrant was defined by anteriorly directed ciliary body, absent ciliary sulcus, steep iris root from its point of insertion followed by a downward angulation, flat iris plane, and irido-angle contact. At least two quadrants had to fulfill these UBM criteria for an eye to be classified as having plateau iris. A-scan biometry was used to measure anterior segment parameters.

Results: Ninety-one subjects with PAC (58 subjects) or PACG (33 subjects) and 68 normal controls were recruited. The mean (standard deviation) ages of PAC and PACG patients and normal controls were 73.5 (6.2) and 72.6 (7.3), respectively. Based on UBM criteria, plateau iris was found in 16 eyes (17.6%) of 91 eyes. In these 16 eyes, quadrant-wise analysis showed ten eyes (62.5%) had plateau iris in two quadrants; four eyes (25%) had plateau iris in three quadrants; and two eyes (12.5%) had plateau iris in four quadrants. Anterior chamber depth, lens thickness, axial length, lens position, and relative lens position were not statistically significant between the group having plateau iris and that not having plateau iris, respectively.

Conclusion: Approximately 20% of Japanese subjects with PAC and PACG with a patent laser peripheral iridotomy were found to have plateau iris on UBM. No morphological difference was noted in the anterior segment of the eye between those with or without plateau iris.

No MeSH data available.


Related in: MedlinePlus

Ultrasound biomicroscopy image of a quadrant of a primary angle closure glaucoma eye with plateau iris.Notes: Irido-angle contact (a), anteriorly directed ciliary process (b), absent ciliary sulcus (c), and iris angulation (d) are shown.
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f1-opth-9-1159: Ultrasound biomicroscopy image of a quadrant of a primary angle closure glaucoma eye with plateau iris.Notes: Irido-angle contact (a), anteriorly directed ciliary process (b), absent ciliary sulcus (c), and iris angulation (d) are shown.

Mentions: UBM images were graded qualitatively in all four quadrants by a single glaucoma specialist (TM) without clinical information. Based on UBM images, plateau iris was defined in a quadrant if all the following criteria were fulfilled (Figure 1):7,8


Plateau iris in Japanese patients with primary angle closure and primary angle closure glaucoma.

Mizoguchi T, Ozaki M, Wakiyama H, Ogino N - Clin Ophthalmol (2015)

Ultrasound biomicroscopy image of a quadrant of a primary angle closure glaucoma eye with plateau iris.Notes: Irido-angle contact (a), anteriorly directed ciliary process (b), absent ciliary sulcus (c), and iris angulation (d) are shown.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494604&req=5

f1-opth-9-1159: Ultrasound biomicroscopy image of a quadrant of a primary angle closure glaucoma eye with plateau iris.Notes: Irido-angle contact (a), anteriorly directed ciliary process (b), absent ciliary sulcus (c), and iris angulation (d) are shown.
Mentions: UBM images were graded qualitatively in all four quadrants by a single glaucoma specialist (TM) without clinical information. Based on UBM images, plateau iris was defined in a quadrant if all the following criteria were fulfilled (Figure 1):7,8

Bottom Line: A-scan biometry was used to measure anterior segment parameters.The mean (standard deviation) ages of PAC and PACG patients and normal controls were 73.5 (6.2) and 72.6 (7.3), respectively.Based on UBM criteria, plateau iris was found in 16 eyes (17.6%) of 91 eyes.

View Article: PubMed Central - PubMed

Affiliation: Mizoguchi Eye Clinic, Nagasaki, Japan.

ABSTRACT

Purpose: To determine the prevalence of plateau iris in Japanese patients with primary angle closure (PAC) and primary angle closure glaucoma (PACG) and analyze the biometric parameters in patients with plateau iris using ultrasound biomicroscopy (UBM).

Methods: In this cross-sectional observational study, subjects aged >50 years with PAC and PACG who had previously undergone a patent laser peripheral iridotomy underwent UBM in one eye. UBM images were qualitatively analyzed using standardized criteria. Plateau iris in a quadrant was defined by anteriorly directed ciliary body, absent ciliary sulcus, steep iris root from its point of insertion followed by a downward angulation, flat iris plane, and irido-angle contact. At least two quadrants had to fulfill these UBM criteria for an eye to be classified as having plateau iris. A-scan biometry was used to measure anterior segment parameters.

Results: Ninety-one subjects with PAC (58 subjects) or PACG (33 subjects) and 68 normal controls were recruited. The mean (standard deviation) ages of PAC and PACG patients and normal controls were 73.5 (6.2) and 72.6 (7.3), respectively. Based on UBM criteria, plateau iris was found in 16 eyes (17.6%) of 91 eyes. In these 16 eyes, quadrant-wise analysis showed ten eyes (62.5%) had plateau iris in two quadrants; four eyes (25%) had plateau iris in three quadrants; and two eyes (12.5%) had plateau iris in four quadrants. Anterior chamber depth, lens thickness, axial length, lens position, and relative lens position were not statistically significant between the group having plateau iris and that not having plateau iris, respectively.

Conclusion: Approximately 20% of Japanese subjects with PAC and PACG with a patent laser peripheral iridotomy were found to have plateau iris on UBM. No morphological difference was noted in the anterior segment of the eye between those with or without plateau iris.

No MeSH data available.


Related in: MedlinePlus