J Korean Ophthalmol Soc.  2009 Apr;50(4):542-550. 10.3341/jkos.2009.50.4.542.

Measurement of Anterior Segment Using Visante OCT in Koreans

• Lee DG
• Choi SH

• KMID: 2212255
• DOI: http://doi.org/10.3341/jkos.2009.50.4.542

Abstract

PURPOSE: To obtain the average values of anterior segment structures of adult Koreans using Visante OCT in relation to age and sex, and to compare the central corneal thickness values with these measurements using an A-scan ultrasonic pachymeter.
METHODS
Anterior segment images were obtained in 185 Korean (298 eyes) using Visante OCT. Four different parameters (central corneal thickness, anterior chamber depth, anterior chamber angle, and internal anterior chamber diameter) were measured at four meridians (vertical, horizontal, 45 degrees, and 135 degrees). Afterwards, the same examiner performed A-scan ultrasonic pachymetry to measure central corneal thickness.
RESULTS
Central corneal thickness values measured using Visante OCT were significantly less than those obtained using an A-scan ultrasonic pachymeter (p=0.000). Central corneal thickness, anterior chamber angle, and internal anterior chamber diameters were all smaller in females than in males (p<0.05). Anterior chamber depth, anterior chamber angle, and internal anterior chamber diameter showed a significant decrease according to increasing age in both sexes (p<0.05).
CONCLUSIONS
Average values and changes of anterior segment structures in relation to age and sex were established using Visante OCT in Korean adults. These results may be useful as standard values in anterior segment surgeries as well as in the diagnosis and follow-up of certain anterior segment diseases.

Keyword

Anterior segment; Average values; Measurement; Visante OCT

MeSH Terms

Adult
Anterior Chamber
Female
Follow-Up Studies
Humans
Male
Meridians
Ultrasonics

Figure

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  Figure 1. Optical coherence tomography image (Visante OCT) with graphic tools for measurement of different anterior chamber dimensions. A caliper for anterior chamber depth and internal anterior chamber diameter measurements is used. Anterior chamber depth is measured between the corneal endothelium and a line joining the two opposite iris recesses. Internal anterior chamber diameter is measured between corresponding iris recesses.

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  Figure 2. Optical coherence tomography (Visante OCT) cross-sectional view through the anterior chamber angle region. Anterior chamber angle (ACA) is measured with the apex in the iris recess and the arms of the angle passing through a point on the trabecular meshwork at 500 µm from the scleral spur and the point on the iris perpendicularly opposite.

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  Figure 3. An example of pachymetry mode of Visante OCT. Every sector has three values indicating minimum, average, and maximum corneal thickness in sequence from the above. Average value is the representative of the sector.

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  Figure 4. Graphs show the results that there is no statistically significant relationship between central corneal thickness and age.

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  Figure 5. Relationship between several parameters of the anterior segment and age. (A) Anterior chamber depth, (B) anterior chamber angle, and (C) internal anterior chamber diameter show a significant decrease in relation to age. (D) Spherical equivalent shows a significant shift from myopia to hyperopia in relation to age.

Reference

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