This is a phase 3, multicenter, randomized, double-masked, parallel-group, vehicle-controlled study to evaluate the safety and efficacy of DFL24498 compared with vehicle ophthalmic solution, in participants with AKC. Approximately 138 participants who meet all eligibility criteria will be enrolled in the study.
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Inclusion Criteria: Participants are eligible to be included in the study only if all of the following criteria apply: 1. Men or women aged ≥ 18 and ≤ 65 years of age. 2. Diagnosis of AKC in both eyes, including the presence or medical history of the following: 1. other atopic condition (ie,. atopic dermatitis, periocular eczema, asthma, allergic rhinitis), AND 2. chronic allergic blepharoconjunctivitis and/or keratoconjunctivitis. 3. Ocular itching of at least 50 as assessed by VAS scale. 4. Corneal fluorescein staining assessed by modified Oxford scale of at least grade 1 AND a bulbar conjunctival hyperemia assessed by VBR 10 scale of at least 40 (range 0 to 100) in the same eye. 5. A composite symptoms score (CSyS) ≥ 5 (sum of the severity scores graded 0 to 3 for each of the following: itching, tearing, ocular discomfort, photophobia, and mucous discharge score) (CSyS range of 0 to 15). 6. If a woman of childbearing potential (WOCBP), must have a negative pregnancy test at both screening and baseline visit, and use an acceptable contraception method. Exclusion Criteria: Participants will be excluded if any of the following criteria apply: 1. Inability to speak and understand the local language sufficiently to understand the nature of the study, to provide written informed consent, and to allow the completion of all study assessments. 2. Evidence of an active ocular infection in either eye. 3. Intraocular inflammation defined as anterior chamber flare \> 0 by Standardization of Uveitis Nomenclature (SUN) grading, in either eye. 4. Known or suspected ocular malignancy (ocular surface, intraocular, ocular adnexa). 5. Presence of cancer or any other systemic or unstable disease that may affect the ability to participate in the clinical study in the opinion of the investigator including basal cell carcinoma. 6. Participants that are anatomically monocular. 7. Systemic disease not stabilized within 1 month before the screening visit (eg, diabetes with glycemia out of range, thyroid malfunction) or judged by the investigator to be incompatible with the study (eg, current systemic infections) or with a condition incompatible with the frequent assessment required by the study. Note: Additional protocol defined Inclusion/Exclusion criteria apply