Biometry for Intra-Ocular Lens (IOL) power calculation

Biometry for IOL power calculation is most commonly performed after a cataract surgical procedure. The modern medical sciences have helped in the development of many innovative power calculation methods such as the ocular biometry and intraocular lens (IOL) power prediction formulas. These are best known to considerably improve the refractive outcome of cataract surgery for the patient. However, as per biometry in ophthalmology, the success rate of the cataract surgery depends on some factors like the preoperative biometric data axial length or AL, anterior chamber depth, and IOL power calculation formulas which are already specified by the manufacturer as well. In order to get the desired post-operative refraction, it is important to implant the intraocular lens or IOL by calculating the corneal refractive power and axial length.

Methods and approach

In terms of methods and approach of IOL power calculation, many patients with primary IOL implantations were included in the study of the intraocular power calculation. There were several patients with dense media opacities such as mature cataracts, dense PSC, and posterior polar cataracts where the IOL power calculation cannot be performed were excluded. For preoperative conditions patients with Snellen visual acuity was properly accessed and all the patients underwent cycloplegics refraction, slit-lamp examination, and IOP measurements for studying the morphology of cataract by indirect ophthalmoscopy. Post-operation the patients were administered with topical anti-biotic and anti-inflammatory medications and were examined on the 3rd day and after 1 month of surgery as well.

Analysis and results

In the analysis and results of biometry for Intra-Ocular Lens (IOL) power calculation, it was found that among the 156 patients selected for the study, 84 were male and 72 were female. All the patients in the study are of the age group of 50-70 years of age and do have a standard vision with a standard deviation of around 104,66.66% as well. The postoperative visual results show that out of total of 156 patients 71 of them were implanted with IOL which was calculated by IOLM and ultrasound. Among all the patients 40 of them were implanted with IOL with a post-operation refraction range of -0.50 to 0.50. However, the ultrasound patient's count was 43.2% and 56.8% respectively.

Discussion and further readings

As depicted by the best eye surgeon in Dankuni, Howrah, applanation ultrasonography will always be the best method of reassuring and measuring the ocular axial length and is also practiced in most ophthalmic cases as well. However, the PCI-based prototypes and IOL master also have been used to measure the AL with higher accuracy and precision which is best suggested after immersion biometry. With the implementation of optical Al instead of ultrasound AL, the refractive results of cataract surgery have improved significantly. The results suggest that there was a refractive outcome of 23% and the mean absolute error prediction of IOL biometry was less than P<0.0001.

Why ChooseDrishtideep Eye Institute, Dankuni, Howrah

Drishtideep Eye Institute is the best eye hospital in Howrah which has introduced the state-of-the-art and latest Acquired Optimal Biometry (Lenstar) technology for the determination of IOL power in patients. Drishtideep Eye Institute in Dankuni has successfully treated many patients and helped determine their IOL power by incorporating the latest technology and provides eye treatments cost-effectively. Different surgical methods are performed by skilled and experienced eye surgeons for complete recovery from cataract and Drishtideep has got everything covered for you.

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