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Reporting Entity | 12 Months Ended
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Jun. 30, 2025
Reporting Entity [Abstract] |
Reporting Entity | Note 1 Reporting Entity Opthea Limited (the Company) is a listed public company incorporated in Australia. The address of its registered office and principal place of business is: C/- Prime Company Compliance Level 9, 505 Little Collins Street, Melbourne, Victoria 3000, Australia. These consolidated financial statements comprise the Company and its subsidiaries (together referred to as the Group). The Group’s principal activity is the research and development phase of new drugs for novel therapeutic products based on targeting Vascular Endothelial Growth Factors (VEGF) C, D and R3.

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- Definition The entire disclosure of reporting entity. + References No definition available. + Details
Name: | opt_DisclosureOfReportingEntityExplanatory
Namespace Prefix: | opt_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Reporting entity. + References No definition available. + Details
Name: | opt_ReportingEntityAbstract
Namespace Prefix: | opt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration