OCULAR BIOMETRIC STUDY DURING ACCOMMODATION
Journal Title: International Journal of Medical and Clinical Research - Year 2012, Vol 3, Issue 4
Abstract
We performed this study to measure the ocular changes during accommodation and see whether refractive error has any influence in effect of changes during accommodation. This study was carried out in the Department of Ophthalmology, Pt. B. D. Sharma PGIMS, Rohtak. Seventy five subjects were divided in three groups according to refractive status. Group A consisted of 25 emmetropes. Group B consisted of 25 myopes with myopia <5 D while Group C consisted of 25 hypermetropes with hypermetropia <5 D. The subject was asked to focus on 6/6 line of Snellen’s chart kept at a distance of 6 meters with full refractive correction with the left eye and A-scan was performed on the right eye. Three readings of anterior chamber depth, lens thickness and axial length were taken and the mean values of these reading were calculated. Similar procedure was repeated after accommodation. Accommodation was achieved by asking the subject to focus on N/6 line of near vision chart held at a distance of 33 cm with left eye with full refractive correction on the left eye. Then, the subjects were asked to focus N/6 line of near vision chart held at 12.5 cm to increase the amplitude of accommodation and similar procedure was repeated. The mean increase in axial length was 0.051, 0.004, and 0.005 mm in Groups A, B and C respectively when focus of the left eye was shifted from 6 m to 33 cm. On further increasing the accommodation by shifting the focus of the left eye to 12.5 cm, the axial length increased by 0.08, 0.07, and 0.007 mm in Groups A, B, and C respectively. Increase in lens thickness and decrease in anterior chamber depth were also observed with accommodation in all three groups. There was no significant difference in between three groups in these changes. Conclusions: Subtle but statistically significant increase in axial length was observed with accommodation in this study. There was increase in lens thickness and decrease in anterior chamber depth with accommodation. There was no variation with refractive error in these changes.
Authors and Affiliations
SHRIKANT DESHPANDE
Keywords
Related Articles
- EP ID EP170055
- DOI 10.9735/0976-5530.3.4.150-153
- Views 114
- Downloads 0
RENAL DYSFUNCTION IN MALARIA INFECTION AROUND NAVI MUMBAI
Introduction: Acute renal failure (ARF) is seen mostly in Plasmodium falciparum infection, but P. vivax and P. malariae can cause renal impairment rarely. Malarial ARF is commonly found in adults and older children with...
PROBLEMS FACED IN CONDUCTING CLINICAL TRIALS OF DRUGS IN PMS
Introduction: Premenstrual syndrome is a psychoneuroendocrine disorder of unknown etiology. Even after > 80 years of its 1st description, its definition, presenting patterns , diagnostic plan and treatment modalities are...
THYROID FUNCTION TESTS IN NIGERIAN HIV SERO- POSITIVE PATIENTS ON HIGHLY ACTIVE ANTIRETROVIRAL THERAPY (HAART)
Background: Recent studies suggest that the prevalence of hypothyroidism among human immunodeficiency virus (HIV) people who were on treatment with highly active antiretroviral therapy (HAART) was higher than that in tre...
A STUDY OF PHARMACOKINETICS OF ATORVASTATIN ON TYPE 2 DIABETIC & DYSLIPIDEMIC BENGALI POPULATION OF INDIA AND BANGLADESH
Objective: Type 2 diabetes (T2DM) is a global problem and WHO reported one million one hundred thousand deaths per year globally due to diabetes [1]. T2DM increases the mortality due to cardiovascular disease [2]. The st...
RISK-ADAPTED TREATMENT OF CHILDHOOD HODGKIN’S LYMPHOMA
Purpose: The comparative analysis of the efficacy and economic research of risk-adapted therapy with DAL-HD and with original protocol SPbHL-05 for childhood Hodgkin lymphoma (HL) was performed. Patients and Methods: The...