Latest News on Refractive Surgery : March -2020

Photorefractive keratectomy: A technique for laser refractive surgery

The excimer laser offers entirely new corneal surgery procedures. In this paper, we describe conditions for one such procedure, photorefractive keratectomy, the direct reshaping of the cornea’s central optical zone using tissue ablation with far ultraviolet radiation. We present equations for the required tissue ablation to achieve required refractive corrections.  [1]

Corneal refractive surgery with femtosecond lasers

We investigated the use of ultrashort pulsed (femtosecond) laser technology in corneal refractive surgery. When compared to longer pulsewidth nanosecond or picosecond laser pulses, femtosecond laser-tissue interactions are characterized by significantly smaller and more deterministic photodisruptive energy thresholds, as well as reduced shock waves and smaller cavitation bubbles. [2]

Ultrafast (femtosecond) laser refractive surgery

Lasers with ultrafast pulses have been developed to decrease the energy necessary to incise tissues and to decrease damage to surrounding tissues. The IntraLase femtosecond (10−15 seconds) laser has been approved by the FDA for lamellar corneal surgery. [3] 

Trends in Refractive Surgery in Yemen: Consecutive Review of 1933 Cases from a Single Center

Purpose: To study and quantify refractive surgery trends in a single refractive surgery practice.

Methods: A retrospective case series. Medical records were reviewed for all patients completing refractive surgery at Yemen Magrabi Hospital from January 01, 2008 to December 31, 2008.  Patients had one of the following procedures: laser in-situ keratomileusis (LASIK), photorefractive keratectomy (PRK), phakic intraocular lens implants or refractive lens exchange (RLE). [4]

Comparing Refractive and Scheimpflug-image Based Parameters between Right and Left Eyes and between Dominant and Non-dominant Eyes Related to Handedness

Aim: Our aim was to compare refractive and anatomical parameters between right and left eyes and between the dominant and non-dominant eyes of right- and left-handed patients.  Study Design: Clinical observational study. Methodology: Refractometry, optical biometry and Scheimpflug photography were performed in 163, healthy subjects (138 right-handed, 25 left-handed). A hole-in-the-card test was used to determine sighting dominance. The parameters were compared in three groups: differences [5]

Reference

[1] Munnerlyn, C.R., Koons, S.J. and Marshall, J., 1988. Photorefractive keratectomy: a technique for laser refractive surgery. Journal of Cataract & Refractive Surgery14(1), pp.46-52.

[2] Juhasz, T., Loesel, F.H., Kurtz, R.M., Horvath, C., Bille, J.F. and Mourou, G., 1999. Corneal refractive surgery with femtosecond lasers. IEEE Journal of Selected Topics in Quantum Electronics5(4), pp.902-910.

[3] Bamashmus, M.A., Al-Akily, S.A., Al-Shaer, M.Y. and Al-Akhalee, H.A., 2016. Trends in Refractive Surgery in Yemen: Consecutive Review of 1933 Cases from a Single Center. Ophthalmology Research: An International Journal, pp.1-7.

[4] A. Bamashmus, M., A. Al-Akily, S., Y. Al-Shaer, M. and A. Al-Akhalee, H. (2016) “Trends in Refractive Surgery in Yemen: Consecutive Review of 1933 Cases from a Single Center”, Ophthalmology Research: An International Journal, 6(3), pp. 1-7. doi: 10.9734/OR/2016/30713.

[5] Tóth, N., Csutak, A., Hassan, Z., Deák, E., Jr., L. and Nemeth, G. (2018) “Comparing Refractive and Scheimpflug-image Based Parameters between Right and Left Eyes and between Dominant and Non-dominant Eyes Related to Handedness”, Ophthalmology Research: An International Journal, 9(3), pp. 1-8. doi: 10.9734/OR/2018/46026.

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