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Related Concept Videos

Adjusting a Traverse01:12

Adjusting a Traverse

208
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
208

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Three-Random-Point Marking Method for Toric Intraocular Lens Alignment Using the iTrace Aberrometer.

Yongyi Niu1,2, Hongliang Lin3, Yongjie Qin1

  • 1Department of Ophthalmology, Guangdong Eye Institute, Guangdong Academy of Medical Sciences, Guangdong Provincial People's Hospital, Guangzhou, China.

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The three-random-point (TRP) marking method for toric intraocular lens (IOL) alignment is a simple and accurate technique. This method effectively reduces potential errors in preoperative measurements for cataract surgery patients.

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Area of Science:

  • Ophthalmology
  • Surgical Technology
  • Optical Engineering

Background:

  • Toric intraocular lenses (IOLs) correct astigmatism during cataract surgery.
  • Accurate alignment of toric IOLs is crucial for optimal visual outcomes.
  • Current marking methods can be susceptible to errors from patient positioning and manual techniques.

Purpose of the Study:

  • To evaluate the clinical outcomes of the three-random-point (TRP) marking method for toric IOL alignment.
  • To compare the TRP method with the slit-lamp horizontal meridian (SHM) marking method.
  • To assess the accuracy and simplicity of the TRP method using the iTrace aberrometer.

Main Methods:

  • A prospective, randomized comparative trial was conducted.
  • Thirty eyes of 30 patients with corneal astigmatism >1.0 D were enrolled.
  • Patients were randomized into TRP marking or SHM marking groups, with a 3-month follow-up.

Main Results:

  • No statistically significant differences in visual acuity or residual astigmatism were observed between the TRP and SHM groups.
  • The mean toric IOL misalignment was slightly lower in the TRP group (2.66° ± 1.42°) compared to the SHM group (3.29° ± 1.67°), though not statistically significant (P=0.295).

Conclusions:

  • The three-random-point (TRP) marking method using the iTrace aberrometer is a simple and accurate technique for preoperative toric IOL marking.
  • This method can mitigate systematic errors associated with patient head position during keratometry and manual marking.
  • TRP marking offers a reliable alternative for toric IOL alignment in cataract surgery.