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Corneal asphericity changes after implantation of intracorneal ring segment implantation (kera ring) in treatment of KC

Poster Details

First Author: R.Moussa EGYPT

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Abstract Details


To evaluate the visual ,refractive and asphericity changes after ICRs implantation for treatment of KC


Memorial institute for ophthalmic research, Giza, Egypt


The study were done on 25 eyes of 23 keratoconus patients .ICRs (kera ring ) were implanted in intrastromal tunnel at 5mm inner diameter . 1or2 ICRS of 150-300µ thickness and 160-210 arc were implanted. Changes in uncorrected visual acuity (UCVA),best corrected visual acuity (BCVA) and refractive error (sphere ,cylinder )were assessed . keratometric values( k1,K2,Kmax) & corneal asphericity values anterior and posterior respectively (Q ant &Q post ) were measured with Pentacam .


There was clinically significant improvement regarding UCVA from 0.1±0.04 to 0.31±0.17 and BCVA improved from 0.37±0.15 to 0.46±0.1.The spherical error and cylindrical error shows significant decrease postoperatively(p<0.001) . K2 shows significant decrease (p0.001) while K1 and Kmax shows non-significant changes postoperatively (p=0.022)(0.469) respectively .Q anterior shows significant decrease from -1.29±0.55 to -0.78±0.77 (p<0.001) while Q posterior shows non-significant change (p =0.692).


ICRs (kera rings) implantation for treatment of keratoconus changes the anterior corneal asphericity approximating the Q value to the ideal Q value(0.5)and improve the UCVA and the BCVA of patients besides decrease the refractive sphere and cylinder values.

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