الفهرس 
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Abstract
Tvventv e\TS with primary pterygium were ’;e!ceted !1()11ipatients attending to the Out-patient Clinic: at the departl11C’ill\ll’ Ophthalmology or lscnha faculty or medicine duril1~’ the l,eri(1t! I,ilm Jan, 2003 to Dec. 2003. Cases with diseases affecting cornea] 1()pugr~\ph: v.crc excluded, Computer assested analysis or the C\)rIle~d topo~:r~\phy \ using Orbsean Cornear’Topugraphy System \\as l,erl”(1l’mecL CiJrllcal rel”ractive slatus in(:lude pte’l\ !!iul11 ind\(cCll hti:..’m’lti”m referred as Sim K. steepe>l ~1I1d t1~lttcst e(’meal meridian” WCIC C’ludied \\ith the Orbsean There \\as signilieant magnitude or astigmati:,m, Its mean I\as -, D = 3,1. the mann itude was corrc luted to the ptery’:i um exten”ion measured with slit lamp from pter\gial e~I1’ to the limbus
\\ ith mean si;:e 1!J3 ~ 1,13.60% 01” this astigmatism was with the rule. :::5<)” oblique 8:. 15% against the rule astigmatism I!jU”’!) )\\hi\c other complained visually (:::0’;’0 \mong the later the pterygrum si/e W~h gre~\ter \Iith ml’~\\l mm = 1,15 BC V i\ \\~\’i a ffccted and reduced ~\mun!’. mi’S! (I I’ the C:h’ Conclr.ionAfter pterygium excisron there v;as improvement of 1\( \’:\. change in the refractive power of the corneal meridians 1” \,Ird normal val ues and reduction of refracti ve asti gmatism Conclusions With the rule astigmatism was the predominant type in eye with pterygium ’” The magnitude of pterygium induced astigmatism I correlate with the size of the pterygium Subnormal vrsion. corneal astigmatism induced lY’ pterygium are reversible changes after ptcryginl excision Orbscan Corneal Topography System is a reccnt accurate machine. It asses the pterygium induced astigmatism tho sometime neccssiate surgical removal before covering the pupillary area thus it is considered as an accurate means that I~\ cou•ld. influence the decision of SUnl’-CI’\.~;- ;\11 this behind th.: • useful data obtained as pachyrnctrv. divtancc; bctwcc different OCUI,l r structures >Other concomitant refractive surgery rather than pterygium c.g. cataract extraction which require preoperative assessment of the re.ractive state of the eye is better to be eferred for one month after pterygium excision to ensure correction of refractive changes induced by pterygium.