Axial Length, High Myopia, Visual Quality
Conditions
Keywords
Axial length, High myopia, SMILE, Higher-order aberration, visual quality
Brief summary
This retrospective study aimed to investigate the subjective and objective visual outcomes following Small Incision Lenticule Extraction (SMILE) surgery in high myopic patients with varying axial lengths (AL).
Detailed description
The study enrolled 113 highly myopic patients (202 eyes) who underwent SMILE surgery at Shanghai's Tenth People's Hospital. Patients were classified into three groups based on the axial length before surgery: Group A (AL \< 26 mm, 62 eyes), Group B (26 mm ≤ AL \< 27 mm, 88 eyes), and Group C (AL ≥ 27 mm, 52 eyes). Preoperative and postoperative evaluations included uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), equivalent spherical error(SE), and corneal high order aberration. Subjective visual quality was assessed using the Quality of Vision (QoV) questionnaire.
Interventions
This study does not involve any interventions
Sponsors
Shanghai 10th People's Hospital
yuhao shao
Study design
Observational model
CASE_CONTROL
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 40 Years
Healthy volunteers
Yes
Inclusion criteria
* manifest refraction spherical equivalent refraction exceeding -6.00D; * stable myopia for a duration of at least 2 years; * corrected distance visual acuity of at least 20/25; * annual myopic spherical equivalent increment less than - 0.50 D.
Exclusion criteria
* a history of moderate to severe dry eye as well as any ocular or systemic disease.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Subjective visual quality | 12 months | The quality of vision (QOV) questionnaire consists of (i) symptom frequency, (ii) severity, and (iii) bothersomeness for (a) glare, (b) halo, (c) starbursts, (d) hazy vision, (e) blurred vision, (f) distortion, (g) multiple images, (h) visual fluctuations, (i) difficulty focusing, and (j) difficulty judging distance or depth perception. Respondents use a scale of 0 to 3, where zero (0) denotes none, one (1) a little, two (2) quite a bit, and three (3) very much. Furthermore, on a scale from 0 to 10, patients were asked to provide Likert ratings for daytime and nighttime quality of vision (0 denoting the poorest vision, while 10 indicating the best vision) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Refractive results | 12 months | The uncorrected distance visual acuity (UDVA, logMAR), corrected distance visual acuity (CDVA, logMAR), subjective refraction (Diopter), and intraocular pressure (mmHg) were evaluated prior to and 1 year after SMILE. |
Other
| Measure | Time frame | Description |
|---|---|---|
| Ocular high-order aberrations | 12 months | Corneal aberration measurements were performed using a Scheimpflug tomography system (Pentacam; Oculus GmbH, Wetzlar, Germany). Images of the highest quality (designated as OK) were selected for analysis. The coefficients for a standardized diameter of 8 mm were examined, followed by an assessment of the clinical significance of total higher-order aberrations (HOA, mm), spherical aberration (Z4, 0, mm), horizontal coma (Z3, 1, mm), vertical coma (Z3, -1, mm), horizontal trefoil (Z3, 3, mm), and oblique trefoil (Z3, -3, mm) |
Countries
China
Outcome results
None listed