Opthea Ltd — Capital/Financing Update 2013

Feb 6, 2013

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ASX and Media release

7 February 2013

Federal Government R&D Tax Incentive –Circadian Receives $1.3m

Circadian Technologies Limited (ASX:CIR, OTCQX:CKDXY) is pleased to announce that it received a cash payment of $1.3 million in relation to the Australian component of its research and development expenditure for FY12 as part of the Federal Government’s R&D tax incentive.

Under this incentive, companies undertaking research and development activities with a turnover of less than $20 million are entitled to a cash refund of 45 cents per dollar spent on eligible research and development in Australia.

This incentive provides direct assistance for companies like Circadian to continue to fund its research and development activities and build further value within the Group.

Company enquiries

Robert Klupacs Managing Director - Circadian Tel: +61 (0) 3 9826 0399 or robert.klupacs@circadian.com.au

Media enquiries – international Lauren Glaser The Trout Group LLC 251 Post Street, Suite 412 San Francisco, CA 94108 Tel +1 215 740 8468 lglaser@troutgroup.com

About Circadian Technologies Limited

Circadian (ASX:CIR; OTCQX:CKDXY)) is a biologics drug developer focusing on cancer, cancer related and ophthalmic disease therapies. It controls exclusive worldwide rights to a significant intellectual property portfolio around Vascular Endothelial Growth Factor (VEGF)-C and -D. The applications for the VEGF technology, which functions in regulating blood and lymphatic vessel growth, are substantial and broad. Circadian’s internal product development programs are primarily focused on developing VGX-100 (a human antibody against VEGF-C) as a treatment for lymphedema resulting from breast cancer treatment and solid tumours, in particular glioblastoma and colorectal cancer, as well as developing VGX-300 (soluble VEGFR-3) for ‘back of the eye’ disease such as wet Age Related Macular Degeneration. Circadian has also licensed rights to some parts of its intellectual property portfolio for the development of other products to ImClone Systems, a wholly-owned subsidiary of Eli Lilly and Company, including the anti-lymphatic antibody-based drug IMC-3C5 targeting VEGFR-3.

Level 1 10 Wallace Avenue Toorak Victoria 3142 Australia T +61 (3) 9826 0399 F +61 (3) 9824 0083 www.circadian.com.au

ABN 32 006 340 567

Inherent risks of Investment in Biotechnology Companies

There are a number of inherent risks associated with the development of pharmaceutical products to a marketable stage. The lengthy clinical trial process is designed to assess the safety and efficacy of a drug prior to commercialisation and a significant proportion of drugs fail one or both of these criteria. Other risks include uncertainty of patent protection and proprietary rights, whether patent applications and issued patents will offer adequate protection to enable product development, the obtaining of necessary drug regulatory authority approvals and difficulties caused by the rapid advancements in technology. Companies such as Circadian are dependent on the success of their research and development projects and on the ability to attract funding to support these activities. Investment in research and development projects cannot be assessed on the same fundamentals as trading and manufacturing enterprises. Thus investment in companies specialising in drug development must be regarded as highly speculative. Circadian strongly recommends that professional investment advice be sought prior to such investments.

Forward-looking statements

Certain statements in this ASX announcement may contain forward-looking statements regarding Company business and the therapeutic and commercial potential of its technologies and products in development. Any statement describing Company goals, expectations, intentions or beliefs is a forward-looking statement and should be considered an at-risk statement. Such statements are subject to certain risks and uncertainties, particularly those risks or uncertainties inherent in the process of developing technology and in the process of discovering, developing and commercialising drugs that can be proven to be safe and effective for use as human therapeutics, and in the endeavour of building a business around such products and services. Circadian undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events, or otherwise. Actual results could differ materially from those discussed in this ASX announcement.