It is by far one of the most significant factors contributing to irreversible bilateral blindness.¹

There have been efforts to develop screening techniques for the early diagnosis of the condition since early detection and treatment may reduce the incidence of visual field loss and subsequent blindness.²

If glaucomatous optic disc degeneration and field loss are to be prevented, patients must be properly screened, referred, counselled, and treated². The differences in central corneal thickness have an impact on the precision of intraocular pressure measurement using Non-contact tonometry. The current study compares the central corneal thickness of people with open angle glaucoma, those with normal tension glaucoma.

Normal-tension glaucoma is a characteristic glaucomatous optic neuropathy with intraocular pressures in the normal range.³ Primary open angle glaucoma (POAG) is a subset of the glaucomas defined by an open, normal appearing anterior chamber angle and raised intraocular pressure (IOP), with no other underlying disease.⁴

Measurement of central corneal thickness is one of the most crucial factor in the evaluation of any suspected glaucoma patient. is measured using ultrasonic pachymeter which is based on traditional A-scan ultrasonography⁵. Normal is 540microns (with a standard deviation of +1 or -1).⁶

A perimetry, often known as a visual field test, evaluates every aspect of vision, including the peripheral vision. Loss of peripheral vision is an early indicator of glaucoma.

Optical coherence tomography (OCT) is a non-invasive, non-contact imaging technique that uses infrared light to obtain high-resolution cross-sectional images of the fundus.⁷

This study aims to evaluate the comparison of central corneal thickness in NTG and POAG. This study is being undertaken to fill up the research void related to the comparison of CCT in glaucoma with the help of various modalities.