An ophthalmic imaging system, comprising: a first imaging system configured to generate a first image of an eye; a second imaging system configured to generate a second image of the eye; an image registration system comprising a processor and instructions stored on a memory, the instructions executable by the processor to cause the image registration system to: receive the first image generated by the first imaging system; receive the second image generated by the second imaging system; track a location of a distal tip of a surgical instrument in the first image; define a priority registration region (220A, 220B, 400A, 400B, 400C, 400D, 500A, 500B, 500C, 500D) in the first image, the priority registration region comprising a portion of the first image within a predetermined proximity of the distal tip of the surgical instrument; register the priority registration region (220A, 220B, 400A, 400B, 400C, 400D, 500A, 500B, 500C, 500D) in the first image with a corresponding region in the second image; and update registration of the priority registration region (220A, 220B, 400A, 400B, 400C, 400D, 500A, 500B, 500C, 500D) in the first image with the corresponding region in the second image in real time as the distal tip is moved, without registering portions of the first and second images that are outside the registration regions, characterised in that: the stored instructions are further adapted to cause the image registration system to: - receive an indication of a current and/or anticipated processing load of the processor and - automatically adjust a size of the priority registration area based on the received indication of the processing load of the processor. a first imaging system configured to generate a first image of an eye; a second imaging system configured to generate a second image of the eye; an image registration system comprising a processor and instructions stored on a memory, the instructions executable by the processor to cause the image registration system to: receive the first image generated by the first imaging system; receive the second image generated by the second imaging system; track a location of a distal tip of a surgical instrument in the first image; define a priority registration region (220A, 220B, 400A, 400B, 400C, 400D, 500A, 500B, 500C, 500D) in the first image, the priority registration region comprising a portion of the first image within a predetermined proximity of the distal tip of the surgical instrument; register the priority registration region (220A, 220B, 400A, 400B, 400C, 400D, 500A, 500B, 500C, 500D) in the first image with a corresponding region in the second image; and update registration of the priority registration region (220A, 220B, 400A, 400B, 400C, 400D, 500A, 500B, 500C, 500D) in the first image with the corresponding region in the second image in real time as the distal tip is moved, without registering portions of the first and second images that are outside the registration regions, characterised in that: the stored instructions are further adapted to cause the image registration system to: - receive an indication of a current and/or anticipated processing load of the processor and - automatically adjust a size of the priority registration area based on the received indication of the processing load of the processor. receive the first image generated by the first imaging system; receive the second image generated by the second imaging system; track a location of a distal tip of a surgical instrument in the first image; define a priority registration region (220A, 220B, 400A, 400B, 400C, 400D, 500A, 500B, 500C, 500D) in the first image, the priority registration region comprising a portion of the first image within a predetermined proximity of the distal tip of the surgical instrument; register the priority registration region (220A, 220B, 400A, 400B, 400C, 400D, 500A, 500B, 500C, 500D) in the first image with a corresponding region in the second image; and update registration of the priority registration region (220A, 220B, 400A, 400B, 400C, 400D, 500A, 500B, 500C, 500D) in the first image with the corresponding region in the second image in real time as the distal tip is moved, without registering portions of the first and second images that are outside the registration regions, characterised in that: the stored instructions are further adapted to cause the image registration system to: - receive an indication of a current and/or anticipated processing load of the processor and - automatically adjust a size of the priority registration area based on the received indication of the processing load of the processor. - receive an indication of a current and/or anticipated processing load of the processor and - automatically adjust a size of the priority registration area based on the received indication of the processing load of the processor.