Vitreous cavity length in keratoconus: implications for keratoplasty

Messina, Marco; Umapathy, T; Avadhanam, Venkata; Wilde, Craig; Said, Dalia G.; Dua, Hs

doi:10.1038/eye.2017.184

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…O n daily routine visual assessment, numerous instruments are used for diverse ocular biometric parameters measurement of the eye, such as the central corneal thickness (CCT), the anterior chamber depth (ACD), the lens thickness (LT), the vitreous length (VL), or the total axial length (AL). 1 The values of these parameters are relevant because of their relationship with some pathological processes: the CCT measured by pachymetry is an important parameter during a follow-up of conditions such as keratoconus, corneal edema, or glaucoma 2 ; a shallow ACD and the closure of the drainage angle have been identified as a risk factor for glaucoma as well 3 ; LT and its position are necessary data to apply in the intraocular lens calculation formulas, allowing to predict the position in which the intraocular lens will tend to locate itself 4 ; VL measurement has been recommended in keratoconus patients who are going to undergo corneal transplantation because of its better accuracy than with AL in deciding the graft size 5 ; or finally, the AL measured by ocular biometry has become essential in myopia control, 6 as well as in conjunction with the keratometry values, being also fundamental to calculate the intraocular lens power in cataract surgery. 7 Those ocular biometric values could be acquired using either classical or newly developed technologies.…”

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Comparison Between Ocular Biometric Parameters and Intraocular Pressure With and Without Contact Lenses

Noya-Padin,

Nores-Palmas,

Giraldez

et al. 2023

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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Objectives: To compare the values of central corneal thickness, anterior chamber depth (ACD), lens thickness (LT), vitreous length (VL), axial length (AL), and corneal-compensated intraocular pressure performed with and without contact lenses (CL). Methods: Forty volunteer participants (16 men and 24 women, 24.2±2.9 years) were recruited. In a single visit, participants underwent autorefraction, keratometry, biometry, topography, pachymetry, and tonometry with the naked eye (without CL). Then, biometry, pachymetry, and tonometry were repeated twice wearing two CL (somofilcon A and nesofilcon A) fitted in a random order. Results: Many of the ocular biometric values were affected by the use of CL during measurements (paired t test; all P≤0.003), except for LT and VL (Wilcoxon test; both P≥0.272). Corneal-compensated intraocular pressure was also affected by contact lens wear during measurements, obtaining lower values when wearing them (Wilcoxon test; all P≤0.001). Conclusions: Central corneal thickness, ACD, AL, and corneal-compensated intraocular pressure measurements cannot be performed while wearing CL. However, LT and VL measurements were not affected by any contact lens use. In addition, it was observed that ACD results from both devices are not interchangeable either when measured with the naked eye or using any contact lens.

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