Relationship of Axial length of the Eye and IOL power in indigenous people of North East India
Journal Title: IOSR Journal of Dental and Medical Sciences (IOSR-JDMS) - Year 2019, Vol 18, Issue 3
Abstract
Cataract surgery, the most commonly performed surgical procedure worldwide depends on many factors to perform successfully. Some of the factors to mention are advanced surgical instruments, skill of the surgeons and intraocular lens design for satisfactory postoperative refractive results. For achieving this goal, accuracy in biometric measurements is crucial. The ocular biometric characteristics of a population, including axial length (AL), keratometric power (K) are important for selection of most appropriate lenses to be implanted during cataract surgery To our knowledge, publications on studies about the values of ocular biometry parameters from North East India were not much reported.. The present work aims at the first hospital-based population study of ocular biometric characteristics of cataract in older patients of 57yrs to 85yrs fromNorth East India. Materials and methods: Senile cataract patients who had attended outpatient department (OPD) were included in the study. Keratometric readings of vertical and horizontal corneal median (K1 & K2) were measured with manual keratometer and axial length was measured with contact A-scan.Power of IOL was calculated by using SRK-T formula. The data was analysed with descriptive statistics, independent sample t–test and correlation using IBM SPSS Statistics (2015). Results:A total of 160 senile cataract patients were evaluated in the study and out of which 96 (60%) were females and 64(40%) were males. Their age ranged from 57 years to 85 years with a mean of 68.05±6.31 years.The mean±SD keratometric readings(K1 & K2) were 44.34± 1.75 D and 44.36± 2.15 D respectively.The mean±SD axial length was 22.59±0.90 mm in all the variables. The mean ±SD intra ocular lens power was 21.65.22±1.72D. Comparison based on gender showed that the mean±SD K1 in males(44.10±1.75) wasfound lessin females (44.53±1.45, p>0.05).The mean±SD K2 for males (44.17±2.15) was also less in females(44.49±1.45, p>0.05).The mean±SD axial length of eyes in male was 22.97±0.90 mm significantly more when compare to that of females (22.33±0.69 mm p<0.05).The mean±SD IOL power was 20.86±1.72D in males and 22.17±1.42 D in females (p>0.05).AL correlated negatively with K1 (Correlation coefficient ‘r’- 0.543,p<0.05), K2 (-0.452, p<0.05) and IOL (-0.752, p<0.05). Conclusion: The result shows that older cataract patients from North East India have similar ocular biometric characteristic as other populations. Females tend to have more keratometric readings but shorter axial lengths than males thereby females required higher IOL power to be implanted after cataract surgery. It is also found that there is negative strongcorrelation between ocular axial lengthswith the power of IOL.We observed as the axial length increases the power of IOL decreases significantly.
Authors and Affiliations
Dr. Lhingkhohat Haokip, Dr. K. Sorojini Devi
Keywords
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- EP ID EP552599
- DOI 10.9790/0853-1803017376.
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