A Study to Investigate Vamikibart (RO7200220) in Combination With Ranibizumab in Diabetic Macular Edema

Prior treatment

• Prior treatment with panretinal photocoagulation or macular laser to the study eye
• Any intraocular or periocular corticosteroid treatment within the past 16 weeks prior to Day 1 to the study eye
• Prior Iluvien or Retisert implants within 3 years prior to Day 1 to the study eye
• Prior or concomitant treatment with anti-VEGF therapy within 8 weeks prior to Day 1 to the study eye; Vabysmo\^TM within 16 weeks prior to Day 1, prior Beovu® is not permitted
• Prior administration of IVT brolucizumab (Beovu®): ever; vamikibart: \</=24 weeks prior to Day 1) in either eye

Other illness

• Active intraocular or periocular infection or active intraocular inflammation in the study eye
• Any current or history of ocular disease other than DME that may confound assessment of the macula or affect central vision in the study eye
• Any current ocular condition which, in the opinion of the investigator, is currently causing or could be expected to contribute to irreversible vision loss due to a cause other than DME in the study eye

Lab values

• Hemoglobin A1c (HbA1c) of greater than (\>) 12%

Other

• Uncontrolled blood pressure, defined as a systolic value greater than (\>)180 millimeters of mercury (mmHg) and/or a diastolic value \>100 mmHg while a patient is at rest
• Currently pregnant or breastfeeding, or intend to become pregnant during the study
• Any proliferative diabetic retinopathy
• Other protocol-specified inclusion/exclusion criteria may apply

• Diagnosis of diabetes mellitus (Type 1 or Type 2)
• Macular thickening secondary to diabetic macular edema (DME) involving the center of the macula
• Decreased visual acuity attributable primarily to DME
• Ability and willingness to provide written informed consent and to comply with the study protocol
• Willingness to allow Aqueous Humor collection
• For women of childbearing potential: agreement to remain abstinent or use at least one highly effective contraceptive method that results in a failure rate of \<1% per year during the treatment period and for at least 12 weeks after the final dose of study treatment