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Asphericity of the Central and Peripheral Cornea in Myopic Laser Refractive Surgery Patients
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±èÁ¤¹Ì(Kim Jeong-Mee) - À»Áö´ëÇб³ ¾È°æ±¤Çаú
À̱ºÀÚ(Lee Koon-Ja) - À»Áö´ëÇб³ ¾È°æ±¤Çаú
Abstract
¸ñÀû: ±Ù½Ã¼º °¢¸·±¼Àý±³Á¤ ¼ö¼ú¾È¿¡¼ °¢¸· Á߽ɺΠ¹× ÁÖº¯ºÎÀÇ ºñ±¸¸éµµ¸¦ Á¤½Ã¾È°ú ºñ±³ÇÏ°í ¼ö¼úÀüµî°¡±¸¸é±¼Àý·Â°úÀÇ »ó°ü¼ºÀ» °üÂûÇϰíÀÚ ÇÏ¿´´Ù.
¹æ¹ý: ±Ù½Ã¼º °¢¸·±¼Àý±³Á¤¼ö¼úÀ» ¹Þ°í Á¤½Ã»óŰ¡ µÈ 135¾È(Æò±Õ 23.49¡¾2.5¼¼, ¹üÀ§ 20~29¼¼)°ú Á¤½Ã¾È 40¾È(Æò±Õ 22.50¡¾1.7¼¼, ¹üÀ§ 20~25¼¼)À» ´ë»óÀ¸·Î Pentacam (Oculus Inc., Germany) °¢¸·ÇüÅ °Ë»ç±â±â¸¦ »ç¿ëÇÏ¿© °¢¸· 6 mm, 7 mm, 8 mm, 9 mm, 10 mm ¿µ¿ªÀÇ ºñ±¸¸é°è¼ö Q°ªÀ» ÃøÁ¤ÇÏ¿´°í, ¼ö¼ú¾ÈÀº ¼ö¼ú Àü µî°¡±¸¸é±¼Àý·ÂÀÌ -6.00 D ¹Ì¸¸Àº ¼ö¼ú¾È ±×·ì 1(Æò±Õ -4.41¡¾1.09 D, ¹üÀ§ -1.25~-5.58 D)°ú -6.00 D ÀÌ»óÀº ¼ö¼ú¾È ±×·ì 2(Æò±Õ -7.12¡¾0.95 D, ¹üÀ§ -6.00~-9.00 D)·Î ºÐ·ùÇÏ¿© ºñ±³ ºÐ¼®ÇÏ¿´´Ù.
°á°ú: Á¤½Ã¾ÈÀÇ ºñ±¸¸é°è¼ö Q°ªÀº ¸ðµç °¢¸· ¿µ¿ª¿¡¼ negative °ªÀ¸·Î ¿µ¿ª¿¡ µû¶ó -0.34¡¾0.12(6 mm ¿µ¿ª)¿¡¼ -0.52¡¾0.09(10 mm ¿µ¿ª)·Î ÁÖº¯ºÎ ¿µ¿ªÀ¸·Î °¥¼ö·Ï negative °ªÀº ´õ Ä¿Á³°í, ¼öÁ÷°æ¼±ÀÌ ¼öÆò°æ¼±º¸´Ù ´õ Å« negative °ªÀ» º¸¿´´Ù. ±×·¯³ª, ±Ù½Ã¼º °¢¸·±¼Àý±³Á¤ ¼ö¼ú¾ÈÀÇ ºñ±¸¸é°è¼ö Q°ªÀº ¸ðµç °¢¸·¿µ¿ª¿¡¼ positive °ªÀ¸·Î ¿µ¿ª¿¡ µû¶ó 0.84¡¾0.43(6 mm ¿µ¿ª)¿¡¼ 0.09¡¾0.30(10 mm ¿µ¿ª)À¸·Î ÁÖº¯ºÎ·Î °¥¼ö·Ï positive °ªÀÌ °¨¼ÒÇÏ¿´À¸¸ç, °¢¸·ÀÇ 8 mm ¿µ¿ª±îÁö´Â ¼öÁ÷°æ¼±ÀÌ ¼öÆò°æ¼±º¸´Ù positive °ªÀÌ ´õ ÄÇÁö¸¸, 9 mm¿Í 10 mm ¿µ¿ª¿¡¼´Â ¼öÆò°æ¼±ÀÌ ¼öÁ÷°æ¼±º¸´Ù positive °ªÀÌ ´õ Å©°Ô ³ªÅ¸³µ´Ù. ºñ±¸¸é°è¼ö
Q°ªÀº °¢¸·ÀÇ 6 mm, 7 mm, 8 mm ¿µ¿ª¿¡¼ ¼ö¼ú Àü µî°¡±¸¸é±¼Àý·Â°ú ³ôÀº »ó°ü¼ºÀ» º¸¿´´Ù(°¢°¢, R=-0.725, R=-0.744, R=-0.713, p=0.000).
°á·Ð: ±Ù½Ã¼º ±¼Àý±³Á¤ ¼ö¼ú¾ÈÀÇ °¢¸·Çü»óÀº prolate ÇüÅ¿¡¼ oblate ÇüÅ·Πº¯ÈµÇ¸ç ºñ±¸¸é°è¼ö Q°ªÀº negative °ª¿¡¼ positive °ªÀ¸·Î º¯Çϰí, °¢¸·ÀÇ °æ¼±¿¡ µû¸¥ ºñ±¸¸é °è¼öµµ Á¤½Ã¾È°ú ´Ù¸¥ ¾ç»óÀ» º¸¿´´Ù. ÀÌ¿Í °°Àº °¢¸·Çü»óÀÇ º¯È´Â ¾È±¤ÇÐÀû ½Ã±â´É º¯ÈÀÇ ¿¹Ãø°ú ±Ù½Ã¼º °¢¸·±¼Àý±³Á¤ ¼ö¼ú¾ÈÀ» À§ÇÑ ½Ã·Â±³Á¤¿ë ÄÜÅÃÆ®·»Áî ¼³°è ¹× ÇÇÆÃ¿¡ ÇÊ¿äÇÑ ±âÃÊÀڷḦ Á¦°øÇÒ °ÍÀ¸·Î »ç·áµÈ´Ù.
Purpose: To evaluate changes in asphericity (Q-value) of the central and peripheral cornea in myopic corneal refractive surgery group compared with emmetropes and correlation between pre-operative refractive error (spherical equivalent) and Q-value of post-operation.
Methods: One hundred thirty five eyes of 68 subjects (23.49¡¾2.5 years, range 20 to 29) who underwent myopic refractive surgery and 40 eyes of 20 emmetropes (22.50¡¾1.7 years, range 20 to 25) were enrolled. Q-value was measured using a Pentacam Oculyzer topography (Oculus Inc.,Germany) for 6mm to 10mm zones. For analysis of post-op group, the group was classified by pre-op spherical equivalents of < -6.00 D(-4.41¡¾1.09 D, range -1.25 to -5.58) and ¡Ã-6.00 D
(-7.12¡¾0.95 D, range -6.00 to -9.00) as two post-op groups.
Results: The mean Q-values in the emmetropes ranged between -0.34¡¾0.12 (6 mm zone) to -0.52¡¾0.09 (10 mm zone). There was a tendency to become more negative Q-values toward the peripheral zone. The negative Q-values with vertical meridian were greater than those with horizontal meridian in all diameters measured along the corneal meridian. However, the mean Q-values in post-op group ranged between 0.84¡¾0.43 (6 mm zone) to 0.09¡¾0.30 (10 mm zone).
There was a tendency for Q-values to become less positive Q-values toward the peripheral zone. The positive Q-values with vertical meridian in the post-op group were more than those with horizontal meridian in 6 mm, 7 mm and 8 mm zones measured along the corneal meridian. Whereas, the positive Q-values with vertical meridian in the post-op group were lower than those with horizontal meridian in 9mm and 10mm zones. There was a tendency for Q-values to become more
positive with increased pre-op spherical equivalent (P=0.000) and significant correlation between Q-value and pre-op refractive error in 6 mm, 7 mm and 8 mm zones (R=-0.725, R=-0.744 and R=-0.731, respectively).
Conclusions: Q-value was changed from prolate cornea (negative Q-value) to oblate cornea (positive Q-value) in myopic corneal refractive surgery group compared with emmetropes and Q-value according to corneal meridian in post-op group found to be different patterns compared with emmetropes. These changes in Q-value would be provided basic data for outcome of visual performance and for contact lens design and fitting in eyes with a new anatomical configuration induced by corneal refractive surgery.
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°¢¸· ºñ±¸¸éµµ, Q-°ª, ºñ±¸¸é°è¼ö, °¢¸·±¼Àý±³Á¤¼ö¼ú, °¢¸·Çü»ó
Corneal asphericity, Q-value, Asphericity coefficient, Corneal refractive surgery, Corneal topography
KMID :
1159320140160030373
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