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Eye Physics, LLC

11401 Kensington Road
Los Alamitos, CA 90720, USA

Due to the current flood of Russian cyber attacks we have had to remove contact information from this web page. Please contact IsoAid or another user of Eye Physics products for contact info.


New: Eye Physics introduces Spheroidal Surface Reconstruction (SSR) from 3D CT or MRI to map tumors directly to the azimuthal equidistant projection of the inner surface of the eye (aka retinal diagram).

IMPORTANT NOTICE: To all users of BEBIG Plaque Simulator version 5 and earlier versions (PS5). In January 2015, PS5 turned 21 years old and reached end-of-life as a sustainable product. The computers for which it was designed (Apple Macs with PowerPC processors) were phased out by Apple in 2005, the last operating system that supported software emulation of the PowerPC processor was OSX 10.6 which was released in 2009.

Plaque Simulator version 6 (PS6) has been in development and testing since 2012 by Eye Physics, LLC and replaces PS5. PS6 is designed for current Apple Macintosh computers with Apple silicon ARM64 (e.g. M1, M2) System on a Chip (SoC) as well as recent models that used Intel x86 Xeon, Core i5, i7 and i9 processors. PS6 leverages multiple cores to accelerate dosimetry calculations by distributing the work uniformly and concurrently amongst all available physical and logical cores. Please visit the Plaque Simulator page for details. Hardware recommendations are discussed in the PS6 User Guide.

Eye Physics 3rd generation 3D printed plaques.

These plaques are available in many preconfigured (as well as customizable) sizes, shapes, curvatures and source arrangements. The thickness of our plaques ranges between 1.5 and 2.1 mm. Each radionuclide source is individually collimated which promotes intensity modulation and enables the delivery of a conformal dose distribution to the tumor while sparing surrounding retina and the optic nerve. Eye Physics plaques are designed to fit eyes that are spherical or oblate spheroids which assures a close fit to each patient's eye size and curvature.

Many Eye Physics plaques are optimized for tumor height and location. For example, several of our plaques are thin enough (1.5 mm) to slide under a rectus muscle and these models are not circular. These special purpose plaques are shaped to position their suture eyelets in the gaps between muscles, thereby avoiding the necessity to detach a muscle in order to treat a tumor located under the muscle. Other plaque models are optimized to treat ciliary body tumors.

The Plaque Simulator software supports image based 3D modeling of each patient's eye, tumor, plaques, and provides precise calculation of suture coordinates for the surgeon.

New 2021 plaques

These 1.5 mm thick plaque models were introduced in 2021. Pictured are the blue castable resin prototypes that were created using our FormLabs stereolithography 3D printer. These resin protoypes are reproduced in 18K gold alloy using the "lost-wax" casting process.


The Eye Physics models EP2335 and EP2339 are designed for treating medium size tumors located in the anterior hemisphere (e.g. ciliary body tumors) of the eye. These plaques are shaped for a conformal fit to eyes of about 24mm equatorial diameter with slightly oblate anterior hemispheres.


The model EP934 replaces our older manually prototyped model EP930 and is an improved version of our 3D printed model 933. The 934 is designed for treating large peripapilary tumors that wrap around the optic disc. It features a deep notch and slots for up to 7 seeds surrounding the notch. It offers improved dosimetric coverage across the optic disc and a variety of suture template "dummy" options compared to the earlier models.


The EP2028 is designed for treating ciliary body and other medium size tumors located in the anterior hemisphere of the eye. It is a slightly smaller version of the model 2343 shown below.


The EP2343 is a larger variation of the model 2028 for large, tall, ciliary body and other primarily anterior tumors.


The model 2343 was introduced in late 2017.


The EP1930 is a dome shaped plaque designed to arc above the cornea to treat tumors of the iris.

Eye Physics, LLC is a Medical Physics Consulting and Services Company.
The company is led by Emeritus Prof. Melvin Astrahan, PhD, DABR.

NOTICE: Eye Physics plaques are not yet FDA approved (we're working towards getting clarification).

then again, neither are any other eye plaques as far as we know... however, eye plaques and their related accessories and planning programs may be exempt from premarket notification procedures according to this section of Title 21: Sec. 892.5650 Manual radionuclide applicator system.

You can download our shareware and freeware software products using the links in the left column of this web site.

Eye Physics services include:

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