Macula Research Paper

CHAPTER 1

INTRODUCTION

1.1 BACKGROUND

Macula is a round area located at the retina, the posterior part of the eye, which is directly in line with the pupil. It is responsible for the central vision, the vision needed for detailed activities such as reading and writing, and the ability to appreciate color (Lens, Nemeth, and K. Ledford, 2008). Macular evaluation is performed when there are symptoms associated with macular dysfunction. Some of the symptoms are central vision impairment, metamorphopsia, and distortion of image size (micropsia and macropsia). Impairment of central vision is described as something appearing to obstruct the central vision while metamorphopsia is characterized as distortion of image that usually can be determined when a straight line appear wavy. Distortion of image size on the other hand is charaterized as image that either appear bigger …show more content…
As a light source, it uses super luminescent diodes with a wavelength of 840 nm. High speed scanning reduces eye movements and thus, eliminates chances of artifacts. The 3D macula 1024μm² protocol consists of a raster-scan covering an area of 6 x 6mm in the macular region is used for macular thickness measurements. The scans protocol reconstructs a false-color topographic image displayed with numeric averages of thickness measurements for each of the 9 map regions within a 6mm area centered on the fovea, as defined by the Early Treatment Diabetic Retinopathy Study (ETDRS) map (Ooto et al., 2011). Referring to the EDTRS map, the standard retinal subfileds are central, inner superior, inner nasal, inner inferior, inner temporal, outer superior, outer nasal, outer inferior, and outer temporal (Figure 1). The central 1-mm diameter circle of the EDTRS map represents the central fovea while the 3-mm and 6-mm diameter circle represents the inner subfields and outer subfields

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