Visible fluorescent viewing system

A method of viewing a biological object, the method comprising:

• illuminating, using a light source, the biological object with light, wherein the light source comprises a white light source;
• viewing, by a viewing device, the biological object when the biological object is illuminated with the light;
• and
• opening and closing a shutter of the viewing device in accordance with a viewing mode of the viewing device,
• wherein the viewing mode comprises:
• an overlay mode comprising the shutter being open during a first portion of a white light pulse, closed during a second portion of the white light pulse, and open during a fluorescent light pulse, wherein the white light source is on during the first portion of the white light pulse and off during the second portion of the white light pulse.

A viewing device, comprising:

• a shutter configured to open and close in accordance with a viewing mode of the viewing device, wherein the viewing mode comprises:
• an overlay mode comprising the shutter being open during a first portion of a white light pulse, closed during a second portion of the white light pulse, and open during a fluorescent light pulse, wherein a white light source is on during the first portion of the white light pulse and off during the second portion of the white light pulse;
• and
• a connection configured to communicatively couple the viewing device and a viewing device controller, wherein the viewing device controller is configured to control operation of the shutter;
• wherein the viewing device is configured for viewing a biological object when the biological object is illuminated with light.