|Title||CAN HOFSTETTER'S EQUATIONS PREDICT THE AMPLITUDE OF ACCOMMODATION IN NIGERIAN CHILDREN AGED 6 - 18 YEARS?|
|Author, Co-Author||Godwin Ovenseri, Olalekan Oduntan|
Purpose In children amplitude of accommodation is frequently measured to determine their accommodative status and to diagnose the presence of accommodative anomalies. To determine the presence of accommodative insufficiency, the measured amplitude of accommodation is compared with values calculated based on Hofstetter’s equations.
Methods To investigate whether Hofstetter’s equation can accurately predict amplitude of accommodation in Nigerian children aged 6 – 18 years, we measured the amplitude of accommodation in 708 children using the push-up technique. The values obtained were compared with calculated values based on Hofstetter’s equation using the Student’s paired t-test. The Bland-Altman plot was also sued to investigate the agreement between measured and calculated amplitude of accommodation.
Results The mean age of the children was 15.81 ± 3.49 D (95% confidence interval = 15.55 – 16.07D). The mean amplitude of accommodation declined from 18.60 ± 2.71 D for children aged 6 – 9 years to 13.79 ± 2.94 D at age 14 – 18 years. The minimum and average amplitude of accommodation were respectively higher than the calculated minimum and average amplitude of accommodation (calculated based on Hofstetter’s equations) (p < 0.0001). The maximum amplitude of accommodation was significantly lower than calculated maximum amplitude of accommodation (p < 0.0001). The mean difference between the measured and calculated minimum, average and maximum amplitude of accommodation were 0.76 D, 1.20 D and – 1.47 D respectively.
Conclusion From our study, we can conclude that Hofstetter’s equations cannot accurately predict the expected amplitude of accommodation for Nigerian children.
Keywords: accommodation, amplitude of accommodation, Nigerian Children, Hofstetter’s equation
|Affiliation of Co-Authors||Department of Optometry, Madonna University|