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Updated: Aug 5, 2026
05:05
Ultrasound Cyclo Plasty in Eyes with Glaucoma
Published on: January 26, 2018
Control of astigmatism aided by intraoperative keratometry
S C Belmont1, R C Troutman, K A Buzard
1Manhattan Eye, Ear, and Throat Hospital, New York, NY 10021.
Cornea
|September 1, 1993
Summary
Using the Troutman Keratometer during penetrating keratoplasty significantly reduced postoperative astigmatism in keratoconus patients. This surgical technique improves visual outcomes by ensuring better donor-graft alignment.
Area of Science:
- Ophthalmology
- Corneal Surgery
- Refractive Errors
Background:
- Keratoconus is a progressive thinning of the cornea, leading to irregular astigmatism and vision loss.
- Penetrating keratoplasty (corneal transplant) is a common surgical treatment for advanced keratoconus.
- Postoperative astigmatism remains a challenge after penetrating keratoplasty, impacting visual acuity.
Purpose of the Study:
- To evaluate the impact of selective donor button positioning using the Troutman Keratometer on final postoperative astigmatism after penetrating keratoplasty for keratoconus.
- To compare visual outcomes between patients who did and did not use the Troutman Keratometer during surgery.
Main Methods:
- Retrospective analysis of two groups of keratoconus patients undergoing penetrating keratoplasty.
- Group I: Standard penetrating keratoplasty without specific donor button alignment.
- Group II: Penetrating keratoplasty with donor button rotation guided by the Troutman Keratometer for approximate sphericity before suturing.
Main Results:
- The mean final "sutures out" astigmatism was significantly lower in Group II (2.27 D, SD 1.27) compared to Group I (4.64 D, SD 1.89).
- Selective positioning of the donor button using the Troutman Keratometer resulted in a marked reduction in postoperative astigmatism.
Conclusions:
- The Troutman Keratometer is a valuable tool for optimizing donor button orientation during penetrating keratoplasty for keratoconus.
- This technique significantly reduces final postoperative astigmatism, potentially improving visual outcomes for patients.
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