A Study on Ocular Biometric During Accommodation.
Journal Title: International Journal of Medical Science and Innovative Research (IJMSIR) - Year 2019, Vol 4, Issue 5
Abstract
We performed a biometric study that used A-mode ultrasonography on 75 young subjects during ocular accommodation. The subjects between the age group of 18 to 30 years were divided into three groups depending upon their refractive status. Group A comprised of patients with no refractive status (Emmotropes), Group B included patients suffering from Myopia less than -5.0 DSph and Group C includes patients of Hypermetropia less than + 5.0 DSph . After carrying out initial evaluation, A Scan Ultrasonography was performed on the right eye while left eye wearing full refractive correction for distance was focused at a distance of 6 m, 33 cm, 12.5 cm and 33 cm with additional +3 D correction to offset any accommodative effect. The parameters measured were AC depth, lens thickness and axial length in all the Groups A, B & C in the right eye while the left eye, wearing corrective spectacles, focused at distances of 6 m, 33 cm, and 33 cm with an additional correction of +3 D to offset any accommodative effect..In Group A, we measured the same parameters i.e. AC depth, lens thickness, and axial length in the right eye while the left eye, wearing full corrective spectacles during all procedures, focused at distances of 6 m, 33 cm, and 33 cm with an additional correction of +3.0 D to offset any accommodative effect. During accommodation, decreased AC depth and thickening of the lens with increasing level of accommodation were noted in all Groups A, B and C cases. In group A, axial length significantly increased an average of 0.06 +/- 0.01 mm (P < .0005) while the left eye focused at a distance of 33 cm. There were no significant changes with the additional +3.0 D (P < 0.05). In group B & C, axial length significantly increased an average of 0.05 +/- 0.01 mm (P < .0005) when the left eye focused at a distance of 33 cm, and there was further significant elongation of 0.05 +/- 0.01 mm when the left eye focused at a distance of 12.5 cm. Collectively, these results suggest that axial length increases along with changes in the lens and AC depth during ocular accommodation.
Authors and Affiliations
Dr. Ashok Rathi
Keywords
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