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Cover Focus | Jul 2015

Aladdin: Biometry Designed With Three Key Points in Mind

Speed, accuracy, and ease of use are the hallmarks of this device, designed to provide a complete understanding of the refractive properties of an optical system.

The Aladdin and Aladdin LT biometers (Topcon; Figure 1) were designed to provide a complete understanding of the refractive properties of the eye's optical system, according to company literature.1 Aladdin supports the surgeon not only in the choice of spherical IOL power, but also in choosing which premium IOL is right for each eye. Biometry is combined with anterior topography, Zernike corneal wavefront analysis, and pupillometry in one instrument.

The Aladdin series was developed with three key points in mind, according to the company:

1. Speed, with point-and-shoot acquisition of all measurements within 5 seconds (Figure 2);

2. Accuracy, with proven interferometry technology to provide axial length (AL) and corneal radii information for precise determination of IOL spherical power; and

3. Ease of use, with only three clicks needed to print an IOL report that includes the determined IOL spherical power. The console features a color touchscreen monitor with a wide angle of view.

The device can record eight measurements in one acquisition: AL, keratometry, topography, anterior chamber depth, pupillometry, white-to-white distance, central corneal thickness, and lens thickness—although the last two parameters are available only on the Aladdin LT. Software incorporates conventional IOL power calculation formulas such as SRK II, SRK/T, Holladay 1, and Haigis, and postrefractive surgery formulas including Camellin-Calossi and Shammas no-history. The Aladdin LT also includes generic toric IOL calculation capabilities with a toric IOL rotation simulator. IOL brand, type, and power formulas can be compared in order to obtain the best postoperative refractive result.

Figure 1. In addition to OLCR biometry, the Aladdin also incorporates Placido-disc–based corneal topography.

The optical low coherence reflectometry (OLCR) technology used in the Aladdin can penetrate even high-density cataracts due to its use of an 850-nm superluminescent diode and signal processing, according to Topcon. Additionally, the instrument includes the company's real corneal radii (RCR) technology, which gathers approximately 1,000 data points at the 3-mm diameter and measures the corneal radii as reliably and reproducibly as the company's auto-keratorefractometers. These features provide the surgeon with a high degree of accuracy for determining spherical IOL power.

The device creates three summary reports to support surgeon decision-making and facilitate communication between surgeon and patient to choose the best premium IOL for each individual. These include:

1. IOL Power Report, providing an overview of spherical IOL power for any given IOL model or IOL power calculation formula for both eyes of a patient;

2. Measurement Report, giving an overview of all measurements made of both eyes; and

3. Aladdin Report, with an overview of important topographic and pupillary features of both eyes that could influence premium IOL choice.

Detailed data from any measurement feature, such as corneal topography, can also be printed directly from the individual data screens. The device's output is compatible with the User Group for Laser Interference Biometry database, and IOL choices can be customized for each surgeon-user.

Figure 2. With the Aladdin, point-and-shoot acquisition of all measurements takes place within 5 seconds.

In addition to OLCR biometry, the Aladdin also incorporates Placido-disc–based corneal topography to further support IOL choice decisions and provide the diagnostic capabilities of any standalone topography unit, such as analyzing corneal irregularities. Pupil response can be assessed during Placido evaluation with capabilities for mesopic, photopic, and dynamic pupillometry. n

1. Aladdin, Biometer [brochure]. Topcon Europe Medical website. http://www.topcon-medical.eu/eu/products/191-aladdin-biometer.html#downloads. Accessed June 9, 2015.