There are many investigative modalities available for diagnosing<unk> , including history review and physical examination. A thorough history of ocular infections, contact lens usage, other medication, or surgery is necessary to identify possible presence of associated diseases. An ophthalmic examination helps identify whether it is due to local pathogenesis. Physical examinations allow more understanding of the underlying systemic process. A standard testing procedure includes hematological investigations, immunological testing, followed by chest X-ray. Hematological investigations are blood tests estimating hemoglobin, platelet counts, total white blood cell counts, erythrocyte sedimentation rate and viscosity. Other common body checks include urinalysis and liver and renal function tests. The selection of immunological testing for various markers is based on numerous additional medical examinations and clinical history of the patient. Possible markers are antinuclear antibodies, anti-rheumatoid antibodies, and antibodies to cyclic citrullinated peptides. Finally, a chest X-ray helps distinguish whether there are complications, such as pulmonary diseases, due to systemic conditions associated with<unk> . One of the common causes of<unk>  is ocular infections by microorganisms such as bacteria, viruses, and fungi. To detect the causative microorganism, doctors usually collect samples before the commencement of therapy and send them to laboratories. Laboratory personnel then perform smear examination, inoculate the samples on culture media, and perform serological testing. Serological testing is an antibody test providing information on<unk>  etiology. The diagnosis of<unk>  due to systemic conditions requires a combination of serological and hematological testing, together with imaging techniques such as radiography and CT scanning.
Peripheral ulcerative keratitis
Interstitial keratitis
Nummular keratitis
Neurotrophic keratitis
Lattice corneal dystrophy
Diffuse lamellar keratitis
Granular corneal dystrophy
Subepithelial mucinous corneal dystrophy